I managed to get my modem working, and I’m using three SIM cards from Verizon, AT&T, and T-Mobile. However, only the Verizon SIM connects successfully, while both the AT&T and T-Mobile SIM cards are experiencing network registration issues. I’ve already tried switching to the Quectel EC25C-AFX modem chip and set the correct APN settings for each carrier. I’ve also attempted to force LTE-only mode, but I’m still having issues with AT&T and T-Mobile. Any ideas on why this is happening or what else I can try?
Hi @dridri
Can you confirm what band you can sign up for? And which region do you use, may not be able to register because of differences in band support? You can use the AT+QENG=“SERVINGCELL” command to check registration status, or AT+QCFG=“BAND” to check band support status.