How do I activate my IPhone 5s?

How do I activate my IPhone 5s? - 1

Added (1). I purchased an AT&T iPhone 5s 16gb off ebay. The phone came in and it didn't come with a sim card. However everytime I try activating the phone just so I can use the apps and imessage and etc… It says please insert a sim card… Do I have to purchase one from AT&T or is there a way around this. Cause I really just want to get on the phone.

As the message tells you, you need a SIM card. There's no way around it. The SIM card doesn't need to have service; it just needs to be an AT&T one, OR if the phone is unlocked, any compatible carrier's card.

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