Solved: Electron not connecting in South Korea, original setup in Japan

Hi all,

I have taken one of my electrons, which was working fine in Japan, to South Korea for testing (as this is where it will eventually live) but it will not connect to cell.

It is currently running Device OS: 1.0.1 and the simple blinking led firmware example.
All she does is blink green, never cyan or anything else for that matter.

I did some searching on the forum, came across this thread, released ownership of sim, released device, and then tried to claim it but still - no cell connection.
I have also checked antenna connection, electron is by itself (no other devices hooked onto her), checked the sim holder, made sure connections where good, performed an update, but no dice.

From what I read on particle web site, the particle sim uses KT telecom in Korea, and my phone shows the same network with full bars.

Is there anything special I have to do to get it working in a different country?

Do I have to make a separate account for each geographical area I will have devices in?

/r,
Kolbi

It’s not necessary to change any configuration when moving between countries. The Electron 3G U270 Europe/Asia/Africa should work in both Japan and South Korea, and the SIM is global.

There used to be the concept of a home country to calculate roaming fees, but now that all countries have the same base fee of US$2.99 per month it’s not really meaningful and there is no additional roaming charge.

To figure out why you’re not connecting you should get a cloud debug log. Get both a carrier scan and a regular connection attempt.

rickkas7,

Thanks much for the reply. I flashed the electron with the cell debug firmware, tried to perform a carrier scan by selecting ‘c’ but it would not yield that information.

Here is the serial output:

clouddebug: press letter corresponding to the command
a - enter APN for 3rd-party SIM card
k - set keep-alive value
c - show carriers at this location
t - run normal tests (occurs automatically after 10 seconds)
or tap the MODE button once to show carriers
c
starting tests...
turning cellular on...
deviceID=1c5555555555555555538
manufacturer=u-blox
model=SARA-U270
firmware version=23.20
ordering code=SARA-U270-00S-00
IMEI=35555555555550
IMSI=u-blox
ICCID=85555555555555556
0000020470 [app] INFO: enabling trace logging
attempting to connect to the cellular network...
0000020470 [system] INFO: Sim Ready
0000020470 [system] INFO: Sim Ready
0000020471 [system] INFO: ARM_WLAN_WD 1
0000020471 [system] INFO: ARM_WLAN_WD 1

[ Modem::register ] = = = = = = = = = = = = = =
    20.470 AT send      12 "AT+CGREG=2\r\n"
    20.475 AT read OK    6 "\r\nOK\r\n"
    20.475 AT send      11 "AT+CREG=2\r\n"
    20.480 AT read OK    6 "\r\nOK\r\n"
    20.480 AT send      10 "AT+CREG?\r\n"
    20.485 AT read  +   14 "\r\n+CREG: 2,2\r\n"
    20.486 AT read OK    6 "\r\nOK\r\n"
    20.486 AT send      11 "AT+CGREG?\r\n"
    20.492 AT read  +   15 "\r\n+CGREG: 2,2\r\n"
    20.493 AT read OK    6 "\r\nOK\r\n"
    20.493 AT send      10 "AT+URAT?\r\n"
    20.498 AT read  +   14 "\r\n+URAT: 1,2\r\n"
    20.499 AT read OK    6 "\r\nOK\r\n"
    20.499 AT send      10 "AT+CREG?\r\n"
    20.504 AT read  +   14 "\r\n+CREG: 2,2\r\n"
    20.505 AT read OK    6 "\r\nOK\r\n"
    20.505 AT send      11 "AT+CGREG?\r\n"
    20.511 AT read  +   15 "\r\n+CGREG: 2,2\r\n"
    20.512 AT read OK    6 "\r\nOK\r\n"
    35.516 AT send      10 "AT+CREG?\r\n"
    36.517 AT send      11 "AT+CGREG?\r\n"
    37.323 AT read  +   14 "\r\n+CREG: 2,2\r\n"
    37.324 AT read OK    6 "\r\nOK\r\n"
    52.328 AT send      10 "AT+CREG?\r\n"
    53.329 AT send      11 "AT+CGREG?\r\n"
    54.133 AT read  +   14 "\r\n+CREG: 2,2\r\n"
    54.134 AT read OK    6 "\r\nOK\r\n"
    69.138 AT send      10 "AT+CREG?\r\n"
    70.139 AT send      11 "AT+CGREG?\r\n"
    70.944 AT read  +   14 "\r\n+CREG: 2,2\r\n"
    70.945 AT read OK    6 "\r\nOK\r\n"
    85.949 AT send      10 "AT+CREG?\r\n"
    86.950 AT send      11 "AT+CGREG?\r\n"
    87.753 AT read  +   14 "\r\n+CREG: 2,2\r\n"
    87.754 AT read OK    6 "\r\nOK\r\n"
   102.758 AT send      10 "AT+CREG?\r\n"
   103.759 AT send      11 "AT+CGREG?\r\n"
   104.564 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   104.565 AT read OK    6 "\r\nOK\r\n"
   119.569 AT send      10 "AT+CREG?\r\n"
   120.570 AT send      11 "AT+CGREG?\r\n"
   121.374 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   121.375 AT read OK    6 "\r\nOK\r\n"
   122.919 AT read  +   12 "\r\n+CREG: 0\r\n"
   122.920 AT read  +   13 "\r\n+CGREG: 0\r\n"
   127.918 AT read  +   12 "\r\n+CREG: 2\r\n"
   127.920 AT read  +   13 "\r\n+CGREG: 2\r\n"
   128.339 AT read  +   12 "\r\n+CREG: 0\r\n"
   128.340 AT read  +   13 "\r\n+CGREG: 0\r\n"
   133.349 AT read  +   12 "\r\n+CREG: 2\r\n"
   133.350 AT read  +   13 "\r\n+CGREG: 2\r\n"
   136.379 AT send      10 "AT+CREG?\r\n"
   137.380 AT send      11 "AT+CGREG?\r\n"
   138.418 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   138.419 AT read OK    6 "\r\nOK\r\n"
   153.390 AT send      10 "AT+CREG?\r\n"
   154.391 AT send      11 "AT+CGREG?\r\n"
   155.229 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   155.230 AT read OK    6 "\r\nOK\r\n"
   170.234 AT send      10 "AT+CREG?\r\n"
   171.235 AT send      11 "AT+CGREG?\r\n"
   172.039 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   172.040 AT read OK    6 "\r\nOK\r\n"
   187.044 AT send      10 "AT+CREG?\r\n"
   188.045 AT send      11 "AT+CGREG?\r\n"
   188.850 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   188.851 AT read OK    6 "\r\nOK\r\n"
   203.855 AT send      10 "AT+CREG?\r\n"
   204.856 AT send      11 "AT+CGREG?\r\n"
   205.659 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   205.660 AT read OK    6 "\r\nOK\r\n"
   220.664 AT send      10 "AT+CREG?\r\n"
   221.665 AT send      11 "AT+CGREG?\r\n"
   221.982 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   221.983 AT read OK    6 "\r\nOK\r\n"
   232.393 AT read  +   12 "\r\n+CREG: 0\r\n"
   232.395 AT read  +   13 "\r\n+CGREG: 0\r\n"
   236.987 AT send      10 "AT+CREG?\r\n"
   237.303 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   237.304 AT read OK    6 "\r\nOK\r\n"
   237.304 AT send      11 "AT+CGREG?\r\n"
   237.310 AT read  +   15 "\r\n+CGREG: 2,0\r\n"
   237.311 AT read OK    6 "\r\nOK\r\n"
   237.393 AT read  +   12 "\r\n+CREG: 2\r\n"
   237.395 AT read  +   13 "\r\n+CGREG: 2\r\n"
   237.805 AT read  +   12 "\r\n+CREG: 0\r\n"
   237.807 AT read  +   13 "\r\n+CGREG: 0\r\n"
   242.805 AT read  +   12 "\r\n+CREG: 2\r\n"
   242.806 AT read  +   13 "\r\n+CGREG: 2\r\n"
   243.225 AT read  +   12 "\r\n+CREG: 0\r\n"
   243.227 AT read  +   13 "\r\n+CGREG: 0\r\n"
   248.234 AT read  +   12 "\r\n+CREG: 2\r\n"
   248.236 AT read  +   13 "\r\n+CGREG: 2\r\n"
   252.315 AT send      10 "AT+CREG?\r\n"
   253.302 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   253.303 AT read OK    6 "\r\nOK\r\n"
   253.303 AT send      11 "AT+CGREG?\r\n"
   253.309 AT read  +   15 "\r\n+CGREG: 2,2\r\n"
   253.310 AT read OK    6 "\r\nOK\r\n"
   268.314 AT send      10 "AT+CREG?\r\n"
   269.315 AT send      11 "AT+CGREG?\r\n"
   270.120 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   270.121 AT read OK    6 "\r\nOK\r\n"
   285.125 AT send      10 "AT+CREG?\r\n"
   286.126 AT send      11 "AT+CGREG?\r\n"
   286.930 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   286.931 AT read OK    6 "\r\nOK\r\n"
   301.935 AT send      10 "AT+CREG?\r\n"
   302.936 AT send      11 "AT+CGREG?\r\n"
   303.740 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   303.741 AT read OK    6 "\r\nOK\r\n"
   318.745 AT send      10 "AT+CREG?\r\n"
   319.746 AT send      11 "AT+CGREG?\r\n"
   320.550 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   320.551 AT read OK    6 "\r\nOK\r\n"
0000320553 [system] WARN: Resetting WLAN due to WLAN_WD_TO()
0000320553 [system] WARN: Resetting WLAN due to WLAN_WD_TO()

[ Modem::powerOff ] = = = = = = = = = = = = = =
   320.552 AT send       4 "AT\r\n"
   320.555 AT read OK    6 "\r\nOK\r\n"
   320.555 AT send      12 "AT+CPWROFF\r\n"
   320.604 AT read OK    6 "\r\nOK\r\n"
[ ElectronSerialPipe::end ] pipeTx=0 pipeRx=0
[ ElectronSerialPipe::begin ] pipeTx=0 pipeRx=0

[ Modem::powerOn ] = = = = = = = = = = = = = =
   321.914 AT send       4 "AT\r\n"
   323.225 AT send       4 "AT\r\n"
   324.536 AT send       4 "AT\r\n"
   324.539 AT read UNK   3 "AT\r"
   324.540 AT read OK    6 "\r\nOK\r\n"
   324.540 AT send       9 "AT+CGMM\r\n"
   324.545 AT read UNK   8 "AT+CGMM\r"
   324.546 AT read UNK  13 "\r\nSARA-U270\r\n"
   324.547 AT read OK    6 "\r\nOK\r\n"
   324.748 AT send       6 "ATE0\r\n"
   324.753 AT read UNK   5 "ATE0\r"
   324.754 AT read OK    6 "\r\nOK\r\n"
   324.754 AT send      11 "AT+CMEE=2\r\n"
   324.759 AT read OK    6 "\r\nOK\r\n"
   324.759 AT send      19 "AT+CMER=1,0,0,2,1\r\n"
   324.764 AT read OK    6 "\r\nOK\r\n"
   324.764 AT send      15 "AT+IPR=115200\r\n"
   324.769 AT read OK    6 "\r\nOK\r\n"
   324.869 AT send      10 "AT+CPIN?\r\n"
   324.875 AT read  +   16 "\r\n+CPIN: READY\r\n"
   324.876 AT read OK    6 "\r\nOK\r\n"

[ Modem::init ] = = = = = = = = = = = = = = =
   324.876 AT send       9 "AT+CGSN\r\n"
   324.895 AT read UNK  19 "\r\n355555550\r\n"
   324.896 AT read OK    6 "\r\nOK\r\n"
   324.896 AT send       9 "AT+CGMI\r\n"
   324.900 AT read UNK  10 "\r\nu-blox\r\n"
   324.901 AT read OK    6 "\r\nOK\r\n"
   324.901 AT send       9 "AT+CGMR\r\n"
   324.905 AT read UNK   9 "\r\n23.20\r\n"
   324.906 AT read OK    6 "\r\nOK\r\n"
   324.906 AT send       9 "AT+CCID\r\n"
   324.913 AT read  +   30 "\r\n+CCID: 855555556\r\n"
   324.914 AT read OK    6 "\r\nOK\r\n"
   324.914 AT send      11 "AT+UPSV=1\r\n"
   324.919 AT read OK    6 "\r\nOK\r\n"
   324.919 AT send      11 "AT+CMGF=1\r\n"
   324.924 AT read OK    6 "\r\nOK\r\n"
   324.924 AT send      13 "AT+CNMI=2,1\r\n"
   324.929 AT read OK    6 "\r\nOK\r\n"
   324.929 AT send       9 "AT+CIMI\r\n"
   324.935 AT read UNK  19 "\r\n255555551\r\n"
   324.936 AT read OK    6 "\r\nOK\r\n"
0000324938 [system] INFO: Sim Ready
0000324938 [system] INFO: Sim Ready
0000324939 [system] INFO: ARM_WLAN_WD 1
0000324939 [system] INFO: ARM_WLAN_WD 1

[ Modem::register ] = = = = = = = = = = = = = =
   324.938 AT send      12 "AT+CGREG=2\r\n"
   324.942 AT read OK    6 "\r\nOK\r\n"
   324.942 AT send      11 "AT+CREG=2\r\n"
   324.947 AT read OK    6 "\r\nOK\r\n"
   324.947 AT send      10 "AT+CREG?\r\n"
   324.952 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   324.953 AT read OK    6 "\r\nOK\r\n"
   324.953 AT send      11 "AT+CGREG?\r\n"
   324.959 AT read  +   15 "\r\n+CGREG: 2,0\r\n"
   324.960 AT read OK    6 "\r\nOK\r\n"
   324.960 AT send      10 "AT+URAT?\r\n"
   324.966 AT read  +   14 "\r\n+URAT: 1,2\r\n"
   324.967 AT read OK    6 "\r\nOK\r\n"
   324.967 AT send      10 "AT+CREG?\r\n"
   324.973 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   324.974 AT read OK    6 "\r\nOK\r\n"
   324.974 AT send      11 "AT+CGREG?\r\n"
   324.980 AT read  +   15 "\r\n+CGREG: 2,0\r\n"
   324.981 AT read OK    6 "\r\nOK\r\n"
   339.985 AT send      10 "AT+CREG?\r\n"
   340.986 AT send      11 "AT+CGREG?\r\n"
   341.790 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   341.791 AT read OK    6 "\r\nOK\r\n"
   356.795 AT send      10 "AT+CREG?\r\n"
   357.796 AT send      11 "AT+CGREG?\r\n"
   358.600 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   358.601 AT read OK    6 "\r\nOK\r\n"
   373.605 AT send      10 "AT+CREG?\r\n"
   374.606 AT send      11 "AT+CGREG?\r\n"
   375.410 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   375.411 AT read OK    6 "\r\nOK\r\n"
   390.415 AT send      10 "AT+CREG?\r\n"
   391.416 AT send      11 "AT+CGREG?\r\n"
   392.223 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   392.224 AT read OK    6 "\r\nOK\r\n"

   407.228 AT send      10 "AT+CREG?\r\n"
   408.229 AT send      11 "AT+CGREG?\r\n"
   409.033 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   409.034 AT read OK    6 "\r\nOK\r\n"
   424.038 AT send      10 "AT+CREG?\r\n"
   425.039 AT send      11 "AT+CGREG?\r\n"
   425.590 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   425.591 AT read OK    6 "\r\nOK\r\n"
   438.534 AT read  +   14 "\r\n+CIEV: 3,0\r\n"
   438.535 AT read  +   14 "\r\n+CIEV: 7,0\r\n"
   438.537 AT read  +   14 "\r\n+CIEV: 9,0\r\n"
CIEV matched: 9,0
   440.595 AT send      10 "AT+CREG?\r\n"
   440.883 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   440.884 AT read OK    6 "\r\nOK\r\n"
   440.884 AT send      11 "AT+CGREG?\r\n"
   440.889 AT read  +   15 "\r\n+CGREG: 2,0\r\n"
   440.890 AT read OK    6 "\r\nOK\r\n"
   443.532 AT read  +   12 "\r\n+CREG: 2\r\n"
   443.534 AT read  +   13 "\r\n+CGREG: 2\r\n"
   455.894 AT send      10 "AT+CREG?\r\n"
   456.895 AT send      11 "AT+CGREG?\r\n"
   457.699 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   457.700 AT read OK    6 "\r\nOK\r\n"
   472.704 AT send      10 "AT+CREG?\r\n"
   473.705 AT send      11 "AT+CGREG?\r\n"
   474.509 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   474.510 AT read OK    6 "\r\nOK\r\n"
   489.514 AT send      10 "AT+CREG?\r\n"
   490.515 AT send      11 "AT+CGREG?\r\n"
   491.320 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   491.321 AT read OK    6 "\r\nOK\r\n"
   506.325 AT send      10 "AT+CREG?\r\n"
   507.326 AT send      11 "AT+CGREG?\r\n"
   508.131 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   508.132 AT read OK    6 "\r\nOK\r\n"
   523.136 AT send      10 "AT+CREG?\r\n"
   524.137 AT send      11 "AT+CGREG?\r\n"
   524.941 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   524.942 AT read OK    6 "\r\nOK\r\n"
   533.625 AT read  +   12 "\r\n+CREG: 0\r\n"
   533.626 AT read  +   13 "\r\n+CGREG: 0\r\n"
   538.636 AT read  +   12 "\r\n+CREG: 2\r\n"
   538.637 AT read  +   13 "\r\n+CGREG: 2\r\n"
   539.946 AT send      10 "AT+CREG?\r\n"
   540.947 AT send      11 "AT+CGREG?\r\n"
   541.178 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   541.179 AT read OK    6 "\r\nOK\r\n"
   556.183 AT send      10 "AT+CREG?\r\n"
   557.184 AT send      11 "AT+CGREG?\r\n"
   557.989 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   557.990 AT read OK    6 "\r\nOK\r\n"
   572.994 AT send      10 "AT+CREG?\r\n"
   573.995 AT send      11 "AT+CGREG?\r\n"
   574.798 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   574.799 AT read OK    6 "\r\nOK\r\n"
   589.803 AT send      10 "AT+CREG?\r\n"
   590.804 AT send      11 "AT+CGREG?\r\n"
   591.609 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   591.610 AT read OK    6 "\r\nOK\r\n"
   606.614 AT send      10 "AT+CREG?\r\n"
   607.615 AT send      11 "AT+CGREG?\r\n"
   608.419 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   608.420 AT read OK    6 "\r\nOK\r\n"
   623.424 AT send      10 "AT+CREG?\r\n"
   624.425 AT send      11 "AT+CGREG?\r\n"
   625.229 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   625.230 AT read OK    6 "\r\nOK\r\n"
0000625232 [system] TRACE: RSSI: 0dBm BARS: 0

0000625232 [system] WARN: Resetting WLAN due to WLAN_WD_TO()
0000625232 [system] WARN: Resetting WLAN due to WLAN_WD_TO()

[ Modem::powerOff ] = = = = = = = = = = = = = =
   625.231 AT send       4 "AT\r\n"
   625.235 AT read OK    6 "\r\nOK\r\n"
   625.235 AT send      12 "AT+CPWROFF\r\n"
   625.284 AT read OK    6 "\r\nOK\r\n"
[ ElectronSerialPipe::end ] pipeTx=0 pipeRx=0
[ ElectronSerialPipe::begin ] pipeTx=0 pipeRx=0

[ Modem::powerOn ] = = = = = = = = = = = = = =
   626.595 AT send       4 "AT\r\n"
   627.906 AT send       4 "AT\r\n"
   629.217 AT send       4 "AT\r\n"
   629.220 AT read UNK   3 "AT\r"
   629.221 AT read OK    6 "\r\nOK\r\n"
   629.221 AT send       9 "AT+CGMM\r\n"
   629.226 AT read UNK   8 "AT+CGMM\r"
   629.227 AT read UNK  13 "\r\nSARA-U270\r\n"
   629.228 AT read OK    6 "\r\nOK\r\n"
   629.429 AT send       6 "ATE0\r\n"
   629.433 AT read UNK   5 "ATE0\r"
   629.434 AT read OK    6 "\r\nOK\r\n"
   629.434 AT send      11 "AT+CMEE=2\r\n"
   629.439 AT read OK    6 "\r\nOK\r\n"
   629.439 AT send      19 "AT+CMER=1,0,0,2,1\r\n"
   629.445 AT read OK    6 "\r\nOK\r\n"
   629.445 AT send      15 "AT+IPR=115200\r\n"
   629.451 AT read OK    6 "\r\nOK\r\n"
   629.551 AT send      10 "AT+CPIN?\r\n"
   629.557 AT read  +   16 "\r\n+CPIN: READY\r\n"
   629.558 AT read OK    6 "\r\nOK\r\n"

[ Modem::init ] = = = = = = = = = = = = = = =
   629.558 AT send       9 "AT+CGSN\r\n"
   629.577 AT read UNK  19 "\r\n3555555580\r\n"
   629.578 AT read OK    6 "\r\nOK\r\n"
   629.578 AT send       9 "AT+CGMI\r\n"
   629.582 AT read UNK  10 "\r\nu-blox\r\n"
   629.583 AT read OK    6 "\r\nOK\r\n"
   629.583 AT send       9 "AT+CGMR\r\n"
   629.588 AT read UNK   9 "\r\n23.20\r\n"
   629.589 AT read OK    6 "\r\nOK\r\n"
   629.589 AT send       9 "AT+CCID\r\n"
   629.596 AT read  +   30 "\r\n+CCID: 855555556\r\n"
   629.598 AT read OK    6 "\r\nOK\r\n"
   629.598 AT send      11 "AT+UPSV=1\r\n"
   629.603 AT read OK    6 "\r\nOK\r\n"
   629.603 AT send      11 "AT+CMGF=1\r\n"
   629.607 AT read OK    6 "\r\nOK\r\n"
   629.607 AT send      13 "AT+CNMI=2,1\r\n"
   629.612 AT read OK    6 "\r\nOK\r\n"
   629.612 AT send       9 "AT+CIMI\r\n"
   629.618 AT read UNK  19 "\r\n255555551\r\n"
   629.619 AT read OK    6 "\r\nOK\r\n"
0000629621 [system] INFO: Sim Ready
0000629621 [system] INFO: Sim Ready
0000629622 [system] INFO: ARM_WLAN_WD 1
0000629622 [system] INFO: ARM_WLAN_WD 1

[ Modem::register ] = = = = = = = = = = = = = =
   629.620 AT send      12 "AT+CGREG=2\r\n"
   629.626 AT read OK    6 "\r\nOK\r\n"
   629.626 AT send      11 "AT+CREG=2\r\n"
   629.631 AT read OK    6 "\r\nOK\r\n"
   629.631 AT send      10 "AT+CREG?\r\n"
   629.636 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   629.637 AT read OK    6 "\r\nOK\r\n"
   629.637 AT send      11 "AT+CGREG?\r\n"
   629.642 AT read  +   15 "\r\n+CGREG: 2,0\r\n"
   629.643 AT read OK    6 "\r\nOK\r\n"
   629.643 AT send      10 "AT+URAT?\r\n"
   629.649 AT read  +   14 "\r\n+URAT: 1,2\r\n"
   629.650 AT read OK    6 "\r\nOK\r\n"
   629.650 AT send      10 "AT+CREG?\r\n"
   629.656 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   629.657 AT read OK    6 "\r\nOK\r\n"
   629.657 AT send      11 "AT+CGREG?\r\n"
   629.664 AT read  +   15 "\r\n+CGREG: 2,0\r\n"
   629.665 AT read OK    6 "\r\nOK\r\n"
   644.669 AT send      10 "AT+CREG?\r\n"
   645.670 AT send      11 "AT+CGREG?\r\n"
   646.474 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   646.475 AT read OK    6 "\r\nOK\r\n"
   661.479 AT send      10 "AT+CREG?\r\n"
   662.480 AT send      11 "AT+CGREG?\r\n"
   663.283 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   663.284 AT read OK    6 "\r\nOK\r\n"
   678.288 AT send      10 "AT+CREG?\r\n"
   679.289 AT send      11 "AT+CGREG?\r\n"
   680.093 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   680.094 AT read OK    6 "\r\nOK\r\n"
   695.098 AT send      10 "AT+CREG?\r\n"
   696.099 AT send      11 "AT+CGREG?\r\n"
   696.905 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   696.906 AT read OK    6 "\r\nOK\r\n"
   711.910 AT send      10 "AT+CREG?\r\n"
   712.911 AT send      11 "AT+CGREG?\r\n"
   713.715 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   713.716 AT read OK    6 "\r\nOK\r\n"
   728.720 AT send      10 "AT+CREG?\r\n"
   729.721 AT send      11 "AT+CGREG?\r\n"
   730.086 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   730.087 AT read OK    6 "\r\nOK\r\n"
   738.072 AT read  +   14 "\r\n+CIEV: 3,0\r\n"
   738.074 AT read  +   14 "\r\n+CIEV: 7,0\r\n"
   738.076 AT read  +   14 "\r\n+CIEV: 9,0\r\n"
CIEV matched: 9,0
   743.087 AT read  +   12 "\r\n+CREG: 2\r\n"
   743.088 AT read  +   13 "\r\n+CGREG: 2\r\n"
   745.091 AT send      10 "AT+CREG?\r\n"
   745.369 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   745.370 AT read OK    6 "\r\nOK\r\n"
   745.370 AT send      11 "AT+CGREG?\r\n"
   745.376 AT read  +   15 "\r\n+CGREG: 2,2\r\n"
   745.377 AT read OK    6 "\r\nOK\r\n"
   760.381 AT send      10 "AT+CREG?\r\n"
   761.382 AT send      11 "AT+CGREG?\r\n"
   762.186 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   762.187 AT read OK    6 "\r\nOK\r\n"
   777.191 AT send      10 "AT+CREG?\r\n"
   778.192 AT send      11 "AT+CGREG?\r\n"
   778.996 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   778.997 AT read OK    6 "\r\nOK\r\n"
   794.001 AT send      10 "AT+CREG?\r\n"
   795.002 AT send      11 "AT+CGREG?\r\n"
   795.808 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   795.809 AT read OK    6 "\r\nOK\r\n"
   810.813 AT send      10 "AT+CREG?\r\n"
   811.814 AT send      11 "AT+CGREG?\r\n"
   812.618 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   812.619 AT read OK    6 "\r\nOK\r\n"
   827.623 AT send      10 "AT+CREG?\r\n"
   828.624 AT send      11 "AT+CGREG?\r\n"
   829.428 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   829.429 AT read OK    6 "\r\nOK\r\n"
   840.806 AT read  +   12 "\r\n+CREG: 0\r\n"
   840.808 AT read  +   13 "\r\n+CGREG: 0\r\n"
   844.433 AT send      10 "AT+CREG?\r\n"
   845.434 AT send      11 "AT+CGREG?\r\n"
   845.826 AT read  +   14 "\r\n+CREG: 2,0\r\n"
   845.827 AT read OK    6 "\r\nOK\r\n"
   845.827 AT read  +   12 "\r\n+CREG: 2\r\n"
   845.829 AT read  +   13 "\r\n+CGREG: 2\r\n"
   860.831 AT send      10 "AT+CREG?\r\n"
   861.832 AT send      11 "AT+CGREG?\r\n"
   862.635 AT read  +   14 "\r\n+CREG: 2,2\r\n"
   862.636 AT read OK    6 "\r\nOK\r\n"

/r,
Kolbi

Carrier scan provided this:

Serial monitor opened successfully:
0000179868 [app] INFO: cellular response type=TYPE_OK len=6
0000179868 [app] INFO: \r\n
0000179868 [app] INFO: OK\r\n
0000179869 [app] INFO: service rat=GSM mcc=65535, mnc=255, lac=0 ci=0 band=GSM 900 rssi=-121 bsic=0 arfcn=0 rxlev=0
looking up operator names...
results...
2G unknown GSM 900 0 bars
clouddebug: press letter corresponding to the command
a - enter APN for 3rd-party SIM card
k - set keep-alive value
c - show carriers at this location
t - run normal tests (occurs automatically after 10 seconds)
or tap the MODE button once to show carriers
starting tests...

I gave the wrong information about the cell carrier in this area, it is actually SK Telecom. But phone gets good bars as stated.

That doesn’t mean your Electron would get the same connection quality.
For one your phone shows a 4G connection but your Electron will most likely be a 3G version. Apart from that mobile phones have much more sophisticated radio modules than IoT devices.

Thanks ScruffR,
I did have the same thought and tomorrow I will take it to a different location here to see if the condition improves, but on the flip side - that I am in the area of a known service provider and yet still get no connection, it makes it difficult to use such information to determine feasibility of deployment and somewhat concerning.

Another thought I had, and I don’t have a great deal of cellular knowledge, is maybe in certain areas the more modern bands, such as 4g, are provided and the others to be somewhat limited?

BLUF: This morning the electron attached to the cell network and began to breathe cyan as normal.

Since the last day where it was not connecting, I have not moved it from its case or anything. Once I completed cell debug testing (in which it couldn’t connect), I pulled power and let it sit. This morning I planned to take the device to my work site to test the cell connection there so I figured I should charge up the battery as I go to eat breakfast and to my surprise, it fired right off into breathing cyan.

So needless to say I was a bit perplexed by this, I figured the only thing possible would be an intermittent antenna connection, so I powered off, disconnected, moved the antenna, and reconnected, and then powered on, but after five cycles of physically reconnecting and moving the device - it keeps connecting with no issues. With that physical testing performed, I find it unlikely that it is an antenna or antenna physical connection issue.

So what could be the reason? Does it take a few days for cellular provisioning from one country/ carrier to change over to the other? I do know that cellular networks are extremely locked down in South Korea so it may be that the handshaking between particle and KT could take a bit, but I am no expert on the inner workings of such. Could it still be the antenna but just not that I can recreate to issue? Your thoughts?

Also, big thanks to @rickkas7 for taking the time to review the logs, and as always thanks to @ScruffR for providing support! You guys are truly awesome!

/r,
Kolbi

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