Unable to activate iPhone 7

If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support

..gaganv1234..

Perhaps your cellular provider has adequate facilities to help you with iPhone?

In some regions they are first in-line to assist, w/ most brands of cellular service.

• Manually update your carrier settings on your iPhone or iPad - Apple Support

//support.apple.com/kb/HT201270

• If you see No Service or Searching on your iPhone or iPad - Apple Support

//support.apple.com/kb/HT201415

• If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support

//support.apple.com/kb/HT201407

• Wireless carrier support and features for iPhone in the USA and Canada +More - Apple Support

//support.apple.com/kb/HT204039

This often is too sketchy for regular persons, who just want their stuff to work.

The cellular carrier would be expected to supply a replacement SIM card, & etc.

{..Not sure if this would be in least bit of use to you. ~ But, here's hoping, it is.!}

Take it to Verizon. Unless you don’t have I’d you struggle it out lol