IPhones, SIM cards, microSIM, contract, and go phones?

Okay, this might get confusing so stay with me lol.
I have a prepaid android (at&t) and got a new android. We're giving the old android the my brother in law (he has a contract through at&t). He is giving me his iPhone 4s. I got a new regular AND microsim and need to know how to activate them both without locking them to the phone. Any ideas? Please help!

Added (1). How do I activate them? Online or do I just call?

You can activate them both and they won't be locked to either phone. SIMS can be moved around between phones without any problem.

From what I know, sim cards do not lock to any phone. The phone itself can be locked but the sim card is what allows you to communicate with your carrier. If you insert your old sim card into the iPhone 4s, you should get service (if they both work together - this is possible w/ contract AT&T to contract AT&T - I don't know if this is possible w/ prepaid) If this does not work, you need to unlock the iphone 4s. There are several ways to unlock it including jailbreaking, or paying some website to get you an unlock code, or finding someone on ebay. Just google 'unlock iphone 4s'.

For your brother, he needs to do the same with the old prepaid android phone. It needs to be unlocked to be used in another carrier's network. (This does not apply to Verizon phones b/c that uses CDMA technology instead of GSM)

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