Hi guys,
Does anyone having problem registering to T-Mobile network using WISMO228?
Using the AT+CREG? command yields 1, 0.
Is the SIM enabled/active?
Do you actually have any T-Mobile signal?
What does at+cops=? tell you?
Hi,
Running the AT+COPS? command yields:
+COPS: 0,0,“T - Mobile”
But that only shows after forcing the frequency band into 900MHz and PCS1900 using:
AT+PSRDBS=1,18
But, after a while, it will get deregister again from the T-Mobile network.
The AT+CSQ value is not very good. Around 7-9. But, I believe even with that it should get registered.
Any clue what could go wrong?
Surely the USA uses 850MHz 
But, T-Mobile is using the 1900 MHz band, so that won’t really affect?