Apple is a company with lot of ideas and money ,So Apple gets what Apple wants.The little gold-plated circuits — which identify you as a subscriber on a particular carrier — plug into phones, tablets, and basically anything else with a cellular radio. Customers of GSM carriers like AT&T and T-Mobile have been using them since time immemorial; CDMA carriers like Sprint and Verizon have started using them since switching to LTE. Apple hates Credit Card and they even hate SIM Cards. Apple’s dealings with SIM cards in the past seven years
Now with iPad Air 2 and iPad mini 3 , Apple is fulfilling there dreams by introducing a reprogrammable SIM that can be taken from carrier to carrier, switching networks and pricing plans through user-friendly software alone. The sim is called “Apple Sim”.Within a year or two, you’ll probably never see a SIM card in an Apple product again. You may not even see a tray.Apple’s unique place in the market gives it extraordinary power over carriers, which are notorious for being difficult to work with and, often, stuck in their ways. And with the Apple SIM, only a small number of carriers are on board so far: AT&T, T-Mobile, Sprint, and UK’s EE (Verizon, perhaps the most stubborn of them all, is missing). But, as with the introduction of the micro-SIM on the original iPad, this is a tell by Apple. It’s a warning that the next iPhone will be using reprogrammable SIMs — and if a carrier would like to offer that iPhone, it had better start getting ready. It’s easy to imagine that Apple could just eliminate the tray altogether, leaving uncooperative carriers on the sideline.
Apple’s rapid progression from mini- to micro- to nano-SIM has already left us with a fragmented market, and tossing a SIM between Android and iOS phones can lead to provisioning issues that leave you stuck on the phone with customer service.