Originally Posted by azf100
TMo is all GSM 1900MHz
When you get some time read this link http://www.privateline.com/PCS/GSM0.html
. Great reading. I will post this small portion for your viewing. GSM is TDMA based and it "should" put your data connection on hold and let you take the call. CDMA is the system that will put the call directly to voicemeil. This is the correct, complete view of GSM. It's not enough to say, as I have too many times, that GSM and conventional cellular (IS-136) are TDMA based. While that it is true, it is more true to say such systems are TDMA and FDM based.