IPhone 6 with no SIM card?

So I recently bought an IPhone 6 from OfferUp. I checked the IMEI and it hasn't been reported lost or stolen. So I want to turn the phone on. There's a MetroPcs store near me. I thought I'd ask here before I go into the store. Will Metro Pcs be able to turn on my IPhone? Of course I need a SIM card. Would they be able to provide me with card as well?

Gggggggggg

If the phone is legitimate then all you need is a valid SIM card that is compatible with the phone. The phone will then take you throught the set up procedure.