How can I update iOS 15.0 in i phone 7 plus

Hi Ayshabster,

Unfortunately, it does not appear that the device is compatible with iOS 16. However, you can still update to iOS 15 and receive security updates by following the steps here: Update your iPhone or iPad

Important: Before updating your device, make sure to create a backup. If something goes wrong, you will need to use your backup. To create a backup, see here: How to back up your iPhone, iPad, and iPod touch

If this is about another device or something else, let me know.

Hope that helps!