Can I backup without a Wi-Fi connection?
Can I backup without a Wi-Fi connection? My phone is not allowing me to connect to Wi-Fi at all, that is why I need to backup before switching phones.
iPhone 8 Plus, iOS 15
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No, you need WiFi unless you have a 5G phone and your carrier supports it.
Back up iPhone - Apple Support
You can also back up using a computer. See this for more information.
How to back up your iPhone, iPad, and iPod touch - Apple Support