You can buy unused or used SIM cards off of eBay. Also, T-mobile sells a SIM kit that is available at BestBuy for BYOD devices.
The SIM doesn't need to be active. You just need a SIM card.
If the phone is carrier locked you will need either a SIM from that carrier or one of its MVNO's.
The SIM doesn't need to be active. You just need a SIM card.
If the phone is carrier locked you will need either a SIM from that carrier or one of its MVNO's.