I wanted to update my iPhone 7 software to 15.7 in order that I can down load some app on AppStore.

chea219 Said:

"I wanted to update my iPhone 7 software to 15.7 in order that I can down load some app on AppStore.: My iPhone is iPhone 7. I can’t update to software 15.7. Please let me update to software 15.7."

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Updating an iPhone?:

Why the Issue?: Likely there is an issue connecting to Apple's server.

Use a Computer and Ethernet:

Start with attempting an update through use of a computer.  See my User Tip: Update your iPhone Using a Computer - User Tip.

If you cannot use Wi-Fi, then use Ethernet. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple. If you get the same error, the model is likely just not compatible.

What happens when you try?

Can you post a screenshot of the whole screen, it could reveal why you aren't able to update.

Make sure you:

• Are using a WiFi connection (not a hotspot).

• You have an active cell signal (You need both WiFi and cellular service to perform the upgrade).

• Are not using a VPN connection.

• Have your battery charged at least 50%. Better yet, keep it plugged in during the update.

• Do not have power save mode turned on.

• Do not have a beta version installed.

• You have at least 10 gigs of storage available.

Click on this link on what to do if you can't update your phone -

If your iPhone or iPad won't update – Apple Support (UK)

The iPhone 7 is compatible with all iOS 15 updates

so I would say it’s a server issue