1.What is CDMA?

CDMA is a type of cell phone provider. The common CDMA providers are Boost Mobile,Metro Pcs, Page Plus, Sprint, Straight Talk and Verizon.

2. What is GSM?

GSM is another type of cell phone provider, the difference between CDMA and GSM is that GSM uses SIM cards. The common GSM providers are AT&T, H20 Wireless, Simple Mobile, and T-Mobile.