If I switch my iPhone 5 Sim Card to a factory unlocked iPhone 5, will it still work?

I have AT&T. If I take out my current iPhone 5 sim card and place it into another iPhone 5 that is factory unlocked and purchased from Apple will it automatically transfer all the memory to the new iPhone?

The only thing that will happen is that the new device will have telephone service with the same number.

Apple doesn't use the SIM card for any sort of data storage.

If you want to replicate the original handset, you'd need to make a full backup (to iCloud or your computer), then do a restore to the new device.

The answer is no. You will need to re-download and re-setup your icons. They only thing that is stored on the sim card is - maybe - your contacts.

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