I offer you the official unlock your iPhone 5S, 5C of the operator AT & T for the IMEI. After unlocking iPhone becomes NEVERLOCK and you can use it on any network with any GSM operator, just feel free to update the firmware.
How to unlock iPhone?
1. On the iPhone go to Settings -> General -> About your device and rewrite figures from the fields "IMEI" and "Model".
2. buy goods and fill out the form
3. Wait a response confirmation of readiness unlock (within 12 hours)
4. Connect your iPhone to iTunes, insert the SIM card for your carrier and get the notice of unlocking. Sometimes you need to unlock the phone to restore the latest firmware.
Unlock phone for 1 - 3 days. In some cases, it may be a delay of unlocking your phone.
Unlock is available for the following models: 5S, 5C
Service not: Verizon / Sprint / T-Mobile operators or IMEI which begins on 9900xxxxxxxx.
If the phone is in the black list, it will not run.
If the phone is not found in the base of AT & T Iphone, it will only be a partial refund