A:AnswerYes, in essence, they transfer your old phone's SIM card to this new iPhone. Then, you can keep your same plan without adding a line. You can also see if Best Buy offers you a trade-in value for your old phone to save some money.
Be advised, though. If your previous phone had a LTE SIM card, there could be a cost to upgrade that SIM card to 5G which is needed for this new iPhone.
A:AnswerBasically you need to buy an unlocked device, so you can use it worldwide with any carrier. Go to the Apple store in any city and buy it directly from them unless Bestbuy sells it.
A:AnswerIf you have apple care take it to the apple store or if not take it to a phone repair place such as U Break IFix. Also are you sure it's the screen and not a screen protector that's broken?