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iMore Question Can i jail break a iphone from verizon and use it for at&t?
Jailbreaking is different than SIM unlocking. What you mean is SIM unlocking. But if you have a Verizon iPhone 5 or later, no unlocking is necessary. Due to an agreement with the FCC, all Verizon LTE phones ship SIM unlocked and will work with any GSM carrier. That said, depending on your carrier and location, you may not get LTE service, but you will have voice & data service at least. Pre iPhone 5, I don't know about those.