To follow up, it appears that AT&T only supports the SIM900B module, which probably explains why I had such a hard time getting a SIM card from them. (m2msupport.net/m2msupport/search … proved=ATT).
To follow up, it appears that AT&T only supports the SIM900B module, which probably explains why I had such a hard time getting a SIM card from them. (m2msupport.net/m2msupport/search … proved=ATT).