Trying to figure this out for a week or two before I came across the AT command tool. Hoping it would help but I just get the same result. I am using an MG323 development board and driving through PC using the tool. Details of problem in command sequence below. O2 or other SIMs work fine but with vodafone it just locks up when I try to send a text message. I have to reset the board to get the MG323 operating again. Any suggestions?
Checking registration status…
Checking SMS Mode…
SMS message for is configured for Text mode
Device is configured for Text mode for SMS.