I was wondering what carriers are compatible with a sim900 breakout board. I know it needs a GSM network (AT&T,T-mobile,?) but what networks can I use?
It needs a 850/ 900/ 1800/ 1900 MHz frequency to work but who offers that frequency? I personally could not find what frequency cell phone companies offered. From how I understand it is that T-Mobile definitely will work.I have heard several different answers about companies like AT&T and I have seen discussion about sprint (which I don't understand because they are a CDMA carrier).
I have also heard that there are other carriers (Vondafone, nextel,Ting) that might be more cost effective for people like me who are only going to be using the text messaging.
Can someone please set me straight on who I can use.