Switching to iPhone 8. Need help with this particular thing?

So I've has a prepaid iPhone 6s Plus for awhile now and I know with AT&T you can remove the SIM card and put it into another phone with at&t or if it's unlocked. Could you do that with the prepaid SIM card, cause I'm buying an unlocked iPhone 8 Plus off a friend.

As long as the SIM card fits and the phone is unlocked, it'll be fine. The iPhone 6+ and 8 take the same size SIM cards, and it doesn't matter what plan you're on. You'll be OK.

MAKE SURE that security locks, passwords, and Cloud settings are cleared, disabled, turned off before you part with a penny. Do not just ASK - in your presence have him completely turn off the phone, hand it to you, and YOU turn it on from dead and make sure you can get into everything you need to. ITunes, all included apps, etc. This will take a while. Again - BEFORE you give him ten cents. If he balks - then it is likely that the phone is lost our stolen, and most likely bricked. NO - it can't be fixed by Apple!

Doesn't matter if the SIM is prepaid or postpaid, as long as the phone is unlocked it would work.

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