Apple customers got a great opportunity to easily switch their carrier on iPhone 5S and 5c but in the U.S. only. The 3 major mobile operators will work on your new smartphone model because it supports a bigger range of radio spectrum than previous iPhones. Here is how you can change iPhone 5S / 5c carrier without unlock in the United States.
You can easily switch between T-Mobile, Verizon and AT&T. If you live in USA and have either iPhone 5S or iPhone 5c you are not locked to one of these carriers. Of course, you should understand how this works and why your device can support the SIM card of the company it is locked to and some other SIMs.
Step 1: Are You Eligible?
You have to activate you device and data plan with the original carrier using a nano-sized SIM. Use only the SIMs created for Apple devices because their class identifier matters.
Step 2: Switch iPhone 5S / 5c to T-Mobile
This is easy. You can simply insert T-Mobile SIM into an iPhone locked to AT&T or Verizon, reboot and start using it.
According to T-Mobile, the devices sold in its stores are locked and can be unlocked after 40 days from the time you buy your iPhone.
Step 3: Switch iPhone 5c / 5S to AT&T or Verizon
This is more complicated because both companies use your IMEI and SIM’s ICCID in their system to authenticate your device. Without this, you can’t exchange data but you might be able to use the “voice portion.”
According to Verizon, the 4G iPhones it is selling are always unlocked.
According to AT&T, the gadgets purchased from AT&T stores are locked but can be unlocked if you call at 800-331-0500. If it doesn't help, trusted online factory unlocking sites like this one - att-iphone-unlock.com will help you.