I am testing 2 Borons using a Hologram.io SIM card connecting to Verizon CAT M1. Reason for not using AT&T is because these devices are in rural parts of the country where Verizon has better coverage vs AT&T. The issue I have is the Borons will connect fine to Verizon for about a day/ day and a half…

If I remember correctly there already was some discussion about a similar issue where you need to set a specific Cellular.command() for these SIMs. If you search the forum you’ll probably find that thread.

You are correct and here is the code I am using: Cellular.on(); delay(10000); //10 seconds Log.info(“Clear the SIM blacklist…”); Cellular.command(“AT+CRSM=214,28539,0,0,12,“FFFFFFFFFFFFFFFFFFFFFFFF”\r\n”); Log.info(“Connecting to Particle Cloud…”); Particle.connect(); waitFor(Particle.connect…

Last night I added a 15 second pause before and after the clearing of the sim blacklist. I also added a call to Cellular.connect before the Particle.connect. This code seem to fix the issue. The boron connected to the Verizon network until about 11:45pm. It stopped again and has not connected since. …

Hey Rick, I am setting the profile to Verizon. The issue has something to do with an FPLMN entry getting written to the SIM card. With that entry there, it forbids it to connect to Verizon. I have code that is clearing out the entry but it keeps coming back. CREG returns 2,2 when it occurs. I have …

@rickkas7 Had another observation last night. Followed ( https://help.hologram.io/en/articles/2093798-how-can-i-get-my-device-to-switch-networks-via-at-commands ) instructions to connect to the Verizon network instead of letting the Particle do it though the Cellular.connect Hologram’s instructions…

@Particle9 , Did you ever get this resolved? I too am looking for an alternative to AT&T for a rural location. Thanks, Chip

I normally let Hologram pick the best carrier for me (it alternates between AT&T and Verizon), but I do have code that will explicitly connect to Verizon through Hologram if needed. I use SYSTEM_MODE(MANUAL) and send these commands before Cellular.connect(). AT+COPS=2 AT+URAT=7 AT+UMNOPROF=3 AT+CF…

Hey Picsil, How are you letting Hologram choose between the two carriers? I was under the assumption you had to explicitly choose one UMNOPROF command? Thanks.

+UMNOPROF=0 seems to work. I say seems to because while it’s been solid in the last couple of months of testing, when I got to my pilot site last week (weak Verizon and weaker AT&T signal) it connected at first to AT&T, then quit connecting at all. Not sure what was going on.

Boron - Hologram SIM - Verizon Network Issues

Troubleshooting

rickkas7 July 11, 2019, 4:29pm 5

Have you set the network profile to Verizon using AT+UMNOPROF? If you didn't, I'm surprised you were able to connect at all. I found it to be necessary when using Verizon with a Hologram SIM using the Boron LTE.

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Boron - Hologram SIM - Verizon Network Issues

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