im not able to update the iphone7 its showing no service

vamsikrishnavenkat Said:

"im not able to update the iphone7 its showing no service: unable to activate iphone 7 Its showing no service"

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I. Troubleshooting the No Service:

Either there is no service in your area, or you have to contact your carrier to see what is going on.

II. Updating your iPhone — Use a Mac or PC:

Try updating your iPad using iTunes on your Mac (or on a PC, even). This would allow for a confirmed update. It may be that an install got misconfigured somehow. How to do so...,

• Mac: Update Software on iOS Devices in iTunes on Mac - Apple Support
• PC: Update software on iOS and iPadOS devices in iTunes on PC

For more on installing updates, go here: Update your iPhone, iPad, or iPod touch - Apple Support