How to update my iPhone 6plus software with mobile data coz I don’t have WiFi
How to update my iPhone 6plus to 12.5.7 software coz I don’t have a WiFi internet and computer
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You will need either Wi-Fi or a computer to update the iPhone. There is no magical way to update without one of those things.
You an borrow a computer or use a public Wi-Fi at a restaurant or coffee shop.
Click here ➜ Update your iPhone or iPad - Apple Support