How to know if my iPhone is unlocked?

How do I know that the iphone I am buying is unlocked so I can use it abroad?

  • I have AT&T and the seller will have Tmobile, how don't I know he used SAM to have it unlocked from ATT and locked to Tmobile so I won't be able to use it abroad

  • Answer:

    Just make two phone calls. One with the T mobile Sim card, and a second with the AT&T Sim card.

John Varghese at Quora Visit the source

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