If you’re like most people, you probably have an iPhone 12 Pro Max. But if you don’t, or if you don’t have a SIM card, there are a few ways to put a SIM card in your phone. The first way is to buy one. You can buy them online or from the Apple Store. The second way is to use an old phone that has been refurbished and has a sim card in it. The third way is to use a computer with an adapter and insert the sim card into the computer. The fourth way is to use a phone case that has a built-in sim card reader.