Adafruit Fona library with Photon

[ScruffR]

Do you need the call feature including actual VOX or just place a call and hang up again?

I've posted some code that does that here

Electron with Australia Telstra Sim and Sending SMS

Just recently I did something like that for another project SYSTEM_MODE(SEMI_AUTOMATIC) SYSTEM_THREAD(ENABLED) STARTUP(cellular_credentials_set("yourAPN", "", "", NULL)) SerialLogHandler serlog; #define RADIO Cellular int placeCall(const char* telNr, uint32_t duration = 30000); int sendMessage(const char* telNr, const char* msg); void setup() { RADIO.on(); RADIO.connect(); Particle.connect(); } void loop() { static uint32_t ms = 0; if (millis() - ms > 60000) { …

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Update:
Sorry, missed the part about the rotary phone