: Many carriers have shut down 3G networks. An iPhone 5 on iOS 8 may struggle with modern VoLTE requirements for standard calls.
There are two primary methods. for most users because it is untethered (you can reboot without a computer). Method 2 is tethered (requires a computer to boot every time). downgrade iphone 5 to ios 8
: You will likely need a computer (Mac or Linux is often preferred for these legacy tools) and the correct IPSW firmware file for iOS 8.4.1 from a site like ipsw.me. The "Legacy iOS Kit" Method : Many carriers have shut down 3G networks