Why won't my iPhone 7 install iOS 15.2 update?

Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version-

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• The iPhone can not be in Low Power mode
• The battery state of charge must be above 50%
• Your iPhone must have at least 6GB or more free storage space
• Your iPhone cannot be connected through VPN
• You should leave the phone plugged in until it finishes updating, both to assure that it remains above 50% and to keep Wi-Fi enabled (Wi-Fi turns off when the phone sleeps if not connected to power).

Axel F.

so now I need an extra 6GB? Not sure how I am going to find that but there we go.

See this Apple articles below

If you need more space for an update on your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT203097

How to check the storage on your iPhone, iPad and iPod touch

https://support.apple.com/en-gb/HT201656

Clear Other storage on your iPhone or iPad

https://support.apple.com/en-us/HT211686

What's the difference between device storage and iCloud storage?

https://support.apple.com/en-us/HT206504

She gets an error message that states "Cellular Update Failed; Your iPhone cannot make and recieve calls or access cellular data until it has been updated.

See the following Apple articles:

If you can't make or receive calls on your iPhone

https://support.apple.com/en-us/HT201270

Manually update your carrier settings on your iPhone or iPad

https://support.apple.com/en-us/HT201270

I have tried all of those steps on my daughter's Iphone 7, and now her cellular service is not working (Tmobile). She updated from IOS 15 to 15.2. She gets an error message that states "Cellular Update Failed; Your iPhone cannot make and recieve calls or access cellular data until it has been updated. It appears like we need to make another apple IOS update, but nothing is available. On my Iphone 7+, it only installed up to IOS 15.1, and is working on Tmobile, and says that is the latest update for it. I assume that is what hers should be at too. What can we do? Her IOS is what told her to update. Do we need to call Tmobile?

THanks, LPeel

hey, i have the simuler thing i want to set up the iphone 7 for my grandma and i already cleand it out... now i want to login with her apple ID and it's now saying 'there is a update needed to activate your iphone' i already tried it with itunes but it doesnt showup on there can anybody help me...??

hey thank you for your reply! i read it but everything on there i already tried... the problem is that he needs an update but I have already completely emptied the iphone as in the 'set up iphone' thats why get a message with that I 'first have to update it before I can login with the icoud of my grandma'

Each Apple device is linked/associated with an Apple ID of the person who did the setup.

To unlock this Phone, you need the Apple ID and password that were used during set up.

why get a message with that I 'first have to update it before I can login with the icoud of my grandma'

So you need your grandma login details.

If you don't have it you can't use the iPhone.

Apple can't help you.

The only way that I got my daughters iPhone 7 to work, was we did a full back up on her laptop using iTunes. Then we did a full reset on her phone, where everything was wiped out and it was clean and started from scratch. At that point she was able to do the iOS 15.2 update. Then we restored the back up onto her iPhone. That worked out well.

See this Apple article: If you can't activate your iPhone

https://support.apple.com/en-gb/HT201407

You are welcome.

You can try updating your iPhone by connecting it to your computer (Mac or Windows PC with iTunes).

Axel F.

PS, we did call T-mobile but they weren’t able to help with anything. I might’ve messed around with some settings for T-Mobile but I don’t think so.