Our Tests and Research, showed us that the Official IMEI Method supports Sprint USA Network for all iPhone models:

مرسلة بواسطة Unknown أغسطس 02, 2015

www.gsmegypt.me

IMEI method is Processed Officially by Apple and this factory Unlock can be for all iPhones regardless of bootloader, baseband and iOS firmware version up to the latest iOS and beyond (if you don’t know what this means, don’t worry – it simply means they support any handset).
48 hour unlock delivery (unless otherwise stated) over every product.
Working with All iOS 4, iOS 5, iOS 6, iOS 7 , iOS 8 and always upgrade to the latest iOS (And keep your unlocking status).
Every single feature works perfectly 100%, Fix Push Notifications, Facetime and iMessage.
Once you unlock your iPhone you will get a notification on your device. All you have to do is connect your iPhone to iTunes to complete it.
No complicated additional software to install
NO JAILBREAKING REQUIRED!
You won’t lose your Jailbreak.
Upgrade and Sync iPhones using iTunes without fear of ever being locked again.
Your Unlock is Completed in iTunes and processed by Apple.
You Will NOT void Apple’s warranty.
Unlock is guaranteed , or your money back.

Sprint