Can i switch my old iphone 4s to another company?

I have an old iphone 4s thats no longer in service that i want to give to my boyfriend but he has Cspire, and originally on that iphone it was at&t. Its not in service so, can i make it a cspire phone?

I think CSpire uses a CDMA technology and AT&T uses a GSM technology. When iPhone 4s for GSM network is unlocked it can be used for any GSM network in the world, but not any CDMA networks like Verizon or Sprint.

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