EnviroDIY

2020-03-04 at 8:22 PM #13898

Moderator

😛 In double checking what the number would be for Verizon when it appears on the FPLMN, the very first google hit I got was an issue with someone else trying to force a Hologram SIM to use Verizon: https://github.com/botletics/SIM7000-LTE-Shield/issues/163 Per that thread from just a few days ago, others suspect that Verizon has just very recently clamped down again booting out most Hologram users.

Are you totally sure you can’t just use the weak AT&T signal? What about T-Mobile? (As a T-Mobile subscriber, I’m dubious that there’s anywhere that T-Mobile exits and not AT&T.) You might be able to hop to T-Mobile by using bypass and setting the UMNOPROF to 5. I haven’t ever tried it and you might be denied by the network, but here’s a chunk of code you can add to your setup that might work:

    // Extra modem set-up
    Serial.println(F("Waking modem and setting Cellular Carrier Options..."));
    modem.modemWake();  // NOTE:  This will also set up the modem
    // Turn off the cellular radio while making network changes
    modem.gsmModem.sendAT(GF("+CFUN=0"));
    modem.gsmModem.waitResponse();
    // Mobile Network Operator Profile - 0 = SW default
    //                                 - 1 = SIM ICCID selected
    //                                 - 2: ATT
    //                                 - 6: China Telecom
    //                                 - 100: Standard Europe
    //                                 - 4: Telstra
    //                                 - 5: T-Mobile US
    //                                 - 19: Vodafone
    //                                 - 3: Verizon
    //                                 - 31: Deutsche Telekom
    modem.gsmModem.sendAT(GF("+UMNOPROF="), 5);
    modem.gsmModem.waitResponse();
    // Selected network technology - 7: LTE Cat.M1
    //                             - 8: LTE Cat.NB1
    // Fallback network technology - 7: LTE Cat.M1
    //                              - 8: LTE Cat.NB1
    // NOTE:  As of 2020 in the USA, AT&T and Verizon only use LTE-M
    // T-Mobile uses NB-IOT
    // modem.gsmModem.sendAT(GF("+URAT="), 7, ',', 8);
    // modem.gsmModem.waitResponse();
    // Restart the module to apply changes
    modem.gsmModem.sendAT(GF("+CFUN=1,1"));
    modem.gsmModem.waitResponse(10000L);

// Extra modem set-up

Serial.println(F("Waking modem and setting Cellular Carrier Options..."));

modem.modemWake(); // NOTE: This will also set up the modem

// Turn off the cellular radio while making network changes

modem.gsmModem.sendAT(GF("+CFUN=0"));

modem.gsmModem.waitResponse();

// Mobile Network Operator Profile - 0 = SW default

// - 1 = SIM ICCID selected

// - 2: ATT

// - 6: China Telecom

// - 100: Standard Europe

// - 4: Telstra

// - 5: T-Mobile US

// - 19: Vodafone

// - 3: Verizon

// - 31: Deutsche Telekom

modem.gsmModem.sendAT(GF("+UMNOPROF="), 5);

modem.gsmModem.waitResponse();

// Selected network technology - 7: LTE Cat.M1

// - 8: LTE Cat.NB1

// Fallback network technology - 7: LTE Cat.M1

// - 8: LTE Cat.NB1

// NOTE: As of 2020 in the USA, AT&T and Verizon only use LTE-M

// T-Mobile uses NB-IOT

// modem.gsmModem.sendAT(GF("+URAT="), 7, ',', 8);

// modem.gsmModem.waitResponse();

// Restart the module to apply changes

modem.gsmModem.sendAT(GF("+CFUN=1,1"));

modem.gsmModem.waitResponse(10000L);