What is the purpose of iPhone nano SIM card?

? I'm ordering my brand new iPhone 5 from tmobile, am I required to buy a nano SIM card in order to run my new phone? What is the purpose? Which one do I buy?

T mobile will also provide you nano sim with your phone.

"What is the purpose of iPhone nano SIM card?" to make an iphone fully functional and not leave it like an iPod touch

  • Will tmobile swap my micro sim to the nano sim for iPhone 5? Basically I have an iPhone 4 under contract until October 2013, but if I buy an iPhone 5 on pay as you go, will t mobile swap my micro sim to a nano sim whilst I'm under contract?
  • Will an unlocked iphone 5 work with any nano SIM card? My friend is selling me her iphone 5. It's factory unlocked from verison, but she was on tmoblie service. I use straight talk and you can bring your own phone, you just have to buy the nano sim. I bought a tmobile compatible nano sim, assuming since she was on tmoblie service, she bought it from them. Should this be a problem or is this okay?
  • New iPhone 5 Nano Sim Card Says No Service? I upgraded my phone to the iPhone 5 and received it today. I inserted my new nano sim card into the phone, however, it is coming up "no service". Why is this and how do I fix it?
  • Micro sim card to Nano sim card? I currently have an iPhone 4s which has a micro sim card. My phone broke and I want to keep my current sim (micro) and put it in my new phone which is the iPhone 5s. Apperently the … Show more