How to activate my old iPhone?

I washed my iPhone 5 today. I've still got my old 4. What do I do to reactivate it?

I believe iPhone 5 uses the same sim card as iPhone 4 and 4S iPhone. So it may be as simple as switching the sim card into the old phone. Worth a try.

I don't know what your carrier is but on Verizon my daughter activated her iPhone by calling Verizon.

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