I won’t e able to download 15.7 , i have followed the instructions without fail

You need a WiFi connection for the update.

ananduisha Said:

"I won’t e able to download 15.7 , i have followed the instructions without fail"

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Thank you for the screenshot.

Updating and iPhone 7:

Updating to iOS16 may or may not be an option, depends on your device.. So, perform as instructed below for the update installation...

Update Using a Computer:

• Use my User Tip:  Update your iPhone Using a Computer - User Tip
• IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update