I have a device on which a Q268RD is used for 2G connection. It worked well in Europe.
I’ve sent it to Canada, changed the antenna (850/1900), put a proper Rogers’ SIM card, checked that a 2G network is available in my place, but no way to get it running properly.
AT+CSQ return 99,99
Any idea ?
Did you also set those bands in the Q26 
How, exactly, did you check that
What does AT+COPS=? tell you
I have to do so !?
I’ve just check on the documentation. You’re probably talking about AT+WFM command.No I didn’t.
I thought that it was enabled by default. I’ll check on the device…
Thank you for this information.
I’ve checked 2G availabity with a mobile phone (Switching 3G off) and another 2G/GPRSonly modem. Did file transfer with no issue with both.
In additional, please check +WMBS also for band setting.
AT+COPS=? mentioned by awneil is good too to show which carriers are in coverage.
Bands settings was the issue. I’ve setted the US ones with “AT+WMBS=4,1”, restarted the modem then it was able to get a signal, an operator etc.
But I still get an issue (I guess) the modems takes a very long time to be register to the network when switched OFF then ON again. It takes a randoms amount of time, between 1 minutes up to 8 minutes. I think this is not a normal behaviour.
When searching :
AT+COPS?
+COPS: 0
AT+CSQ
+CSQ: 99,99
AT+CREG?
+CREG: 0,2
AT+CCED=0
+CSQ: 99,99
ERROR
Then the modem registers and everythings goes well…
In Europe, I’ve never seen a registration that take more than 30 seconds… Any idea that could improve this ? At least an explanation ?
You should always detach cleanly from the network rather than just powering off.
When it registers, is it Roaming
I was not switching off the modem properly. I think that it was negociating something with the operator after each power up. It could be the “Bearer type selection” (See AT+CBST) because I’ve noticed that this value changed from 0 (Autobaud) to 7 (9600/V32) before the fix. Now, it switchs to 9600/V32 immediatly.
To fix it, I’ve waited that the modem properly connect to the operator (took 3 minutes) then detached with “AT+CFUN=0”.
Problem solved.
Thank you awneil, your help is priceless.
Glad you’re still active on this forum !
You’re welcome