If you don't have a SIM card or don't want to use one, you can still use a Windows or Mac computer with iTunes to set up your iPhone. Again, if you got a new phone and you're just having iPhone X ...

How-To How to unlock an iPhone and use any SIM card Is your iPhone locked to a specific network or carrier? Here's how to break free and unlock your iPhone. .

One of the benefits of having an unlocked iPhone is that you can switch out your SIM card when you travel. International phone plans are expensive, and it’s often much cheaper to buy a new card ...

Regular and Micro-SIM cards are too big for the iPad or iPhone, but this trick enables you to cut down a SIM card to a Nano-SIM so it fits into an iPhone or iPad.