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How do I unlock a Verizon iPhone 4s?

I lost my phone recently and my friend gave me his old Verizon iPhone 4s. However, I'm AT&T so when I inserted my AT&T SIM card into the phone, it said "SIM Not Valid". How do I unlock the phone so my AT&T SIM card works with this phone?

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Re: How do I unlock a Verizon iPhone 4s?
Sr. Leader

Verizon did unlock the 4S in Feb, but if it has not been connected to the network it would not have received the update. The update is reportedly from Apple.

I would plug the phone into a computer with the latest iTunes and do an update.

See this for more info:

Nice! Verizon Just Unlocked Everyone's iPhone 4s For Use On US and International GSM Networks | Prep...