Switching SIM cards quesiton?

I have an iPhone with a contact. If I were to get an unlocked iPhone on eBay or something and add the old iPhone's SIM card to the unlocked iPhone's SIM would it work or does it not work that way?

Yes, it'll work as long as the phone is unlocked. But if you're with Verizon or Sprint, you've to get CDMA version of iPhone so you can active it on your account. If you need help with getting the right phone for your carrier at reasonable price, mail me for more info.

Can't 'add a SIM to a SIM', & in any case unlocked phones don't come with SIMs. You use what SIM you have in that phone.

Yes, it would work. However, iPhone stores contacts in the phone, not on the SIM, so the contact would not move to the new phone. The iPhone can import contacts saved on the SIM, but it won't store its own contacts there. So unless your contact is on the SIM (stored by a previous non-Apple phone), you'll have to move it manually.

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