Why can't i not update my phone to ios 15.7?

Hey there, and welcome to Apple Support Communities blldlmndo_,

We can certainly understand your concern and see you came to us from the article Update your iPhone or iPad.

We recommend checking out these steps on what to do if you cant update your device.

"If your iPhone or iPad won't update

To update your iPhone or iPad, you need a compatible device, an internet connection, and enough storage. It also helps to keep your device connected to a power source.

If you can’t install iOS 16 or iPadOS 16 on your iPhone or iPad

You might be unable to update your iPhone or iPad wirelessly — or over the air — for one of these reasons:

• Your device doesn't support the latest software
• There isn't enough available storage space on your device
• The update takes a long time to download
• Your device isn't able to reach the update server
• The update doesn't complete

If your device doesn't support new software

If you don't see the option to update to new software like iOS 16 or iPadOS 16 when it becomes available, your device might not support the latest release.

1. Identify your iPhone or iPad model.
2. Check whether your iPhone or iPad model is on the list of compatible devices for the latest version of iOS or iPadOS.
3. Update to the latest version of iOS or iPadOS that is available to you.

If you have a compatible device but your iPhone or iPad won't update, try the steps below.

iPadOS 16.1 coming in October

If there's not enough space to update

If there isn't enough space to download and install an update, the software on your device will try to make space. It will remove only app data that it can download again and doesn't remove or relocate any of your data. If your device still doesn't have enough space, you can use your computer to update your device.

If you can't connect your device to your computer, you can make room for the update by removing content and apps on your device that you don't use. Go to Settings > General > [Device name] Storage.

Learn more about the space your apps and content use. "

For additional information, check out this link: If your iPhone or iPad won't update - Apple Support

Kindest regards!