If Wi-Fi is not working and I want to do iCloud backup through cellular data
my Wi-Fi tab is not working in mg iPhone 8 Plus. I want to do iCloud backup through cellular data, how to do it?
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Only if you have an iPhone 12 or 13 or SE 3rd gen with a 5G connection you can use over the 5G network.
Try to get the Wi-Fi network working, see the following Apple articles:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support
Recommended settings for Wi-Fi routers and access points
Recommended settings for Wi-Fi routers and access points - Apple Support
If you need help with your Wi‑Fi password
If you need help with your Wi‑Fi password - Apple Support
If they are On, turn Off Hotspot & VPN.
Then see -> How to back up your iPhone, iPad, and iPod touch with iCloud
How to back up your iPhone, iPad, and iPod touch with iCloud - Apple Support