Matrix user forums

What is the difference between a unlocked gsm phone and a no contract phone? no contract means, i can put in any sim card from which carrier i want . can i by a no contract phone and put a gsm sim card in it. please help me.
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Can an iPhone be converted to CDMA from GSM for use on Verizon or Sprint? I understand that GSM and CDMA are two different communication languages. Can the software in the iphone be altered so that it can speak CDMA language? Does it require a hardware change? Has anyone accomplished the conversion ...