I use cricket, and i'm on a plan called h20. It does use/involve a sim card....i'm really confused on what exactly gsm means. I just really need to know if cricket is currently a gsm carrier? I've looked at passed answers, and they said that cricket was CDMA, but those answers were 3 years ago. So, i'm thinking since I have a sim card from cricket on the H20 plan, that its now GSM? I'm looking to purchase an unlocked iphone, and my answer was that it would accept any GSM carrier. Help please?