how can j update my phone now?

Allison20-1 wrote:

I want to update my phone

Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support If the above Apple articles do not help, please post back with relevant information. 

The iPhone 7 cannot update to iOS 16 or iOS 17, if that might be what you are looking for.

To see if there are any iOS 15.x updates for your phone.......

Tap Settings

Tap General

Tap Software Update

If an update is available, it will appear