Do I need a sim card for an Unlocked iPhone 8 Plus?

Being unlocked just means it can use a sim card from any carrier. It does not in any way mean that it does not need a sim card.

You need a sim card to activate the iPhone. A sim card is what provides the carrier settings and cellular phone number so you can make calls and send messages.

If you don't have one, you can borrow one from someone just to activate the iPhone, and remove it after its been

activated.

Make sure to check with your carrier, and that your imei is clean and that the phone does not have a required balance that has to be paid off. This is assuming that you are buying a used phone and putting it on your network. If you purchased a new phone from a store they should have provided you with a sim card, if not then you may have to go in to check with your carrier. Who is your carrier?

Yes. If the iPhone is unlocked, it can be any sim card that is the correct size.

It does not need to have active service on it. But it does need to be functional. A broken sim will not work.

A SIM card is required to activate an iPhone.