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Can the AT&T SIM card be changed in the Sony Ericsson W518Wa?

can the existing contacts be transfered?

You can put a new SIM card in your phone. But if it's from a different carrier, you need to have your phone unlocked first. Also, if using a new SIM card, you should copy your contacts to your phone memory which you can then transfer to the new SIM card if you wish to.

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