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I just upgraded my phone to a Samsung S9+ Each phone has a different size SIM card the S9+ SIM is a very small card. When you buy the S9+ you must use the SIM that comes with the new phone. You keep the same phone number the new SIM gets activated and your done. Hope this helps.
Sorry, there was a problem. Please try again later.You'll actually get a new sim card with the phone. You call a number, activate the new, start up the phone and voila. It you go to an att store and they do it all for you.
Sorry, there was a problem. Please try again later.If you still have your old phone, they will either do a Samsung or Google backup to the cloud and then just restore your data onto the new phone. So whether you use your old SIM card or not shouldn't matter.
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