Network interruption problem every call drops please solve this problem.

Hello shafayet129,

Thank you for using Apple Support Communities! I understand that you've been experiencing an issue with your network and calls dropping on your iPhone. It's important that you're able to keep in touch with others. I would be happy to help point you towards a resolution.

Check out the following support article, which provides some troubleshooting steps for this issue:

If you can't make or receive calls on your iPhone - Apple Support

The link in this section can also help further troubleshoot the issue you mentioned with the empty network:

"Find out what to do if you see "No service" or "Searching" in the status bar."

Take care.