I use the Q2687 modem, with an AT&T SIM card (with roaming).
The modem was tested in Europe (the Netherlands) and everything worked fine.
Now the modem is in the USA (Cleveland).
And I get a CME Error 812 “Bearer connection failure: GPRS network failure”, with start bearer (AT+WIPBR=4,6,0)
The commands send to modem are:
AT+CSQ (untill field is ok)
=> ERROR (812 with CME enabled)
Can anybody help me out?
The SIM has GPRS, the GSM band should be fine, the APN should be fine, I’m out of options