OK here I am a retired IT person but I am going to ask this anyway? So put to me in layman's terms what's the difference between the technology Verizon (CDMA) I believe and say T Mobile and ATT is it called (GSM) ? Is this in the phone or a protocol or something completely different? If this is elementary sorry I have been tout fishing in the woods of Montana rather than follow technology since I retired. I must admit sometime I do miss it so? Never boring always changing you young folks are lucky you have amazing things coming in your lifetime. Sorry if this sounds sentimental..... LOL