Ios Update By Mobile Data. The only way to update iOS over-the-air is to connect to a WiFi network or to connect via USB and iTunes for non-OTA. Continue by following the onscreen instructions.
Plug your device into power and connect to the internet with Wi-Fi. Click the device button in iTunes toolbar. After recognized by ReiBoot, tap the 'Start' button.
In the settings menu, scroll down and tap on "General" to proceed.
To see the version of carrier settings on your device, tap Settings > General > About and look next to.
Choose Cellular from the root list. Connect your iPhone with the computer via a USB cable. Before you update, set up iPhone to back up automatically, or back up your device manually.