Apple customers have a great opportunity to easily switch their carrier on iPhone 5S and 5c — but in the United States only. The three major mobile operators will work on your new smartphone model because it supports a larger range of radio spectrum than previous iPhones. Here is how U.S. customers can change their iPhone 5S / 5c carrier without unlocking or jailbreaking.
If you live in the U.S.A. and have either an iPhone 5S or an iPhone 5c you can easily switch carriers between T-Mobile, Verizon and AT&T. This instructable will help understand how this works and why your device can support the SIM card of the company it is locked to as well as some other SIMs.This method unfortunately won’t work for the cell phone carriers Sprint and Virgin.