How fix the iphone when there is no service in the network after i upgrade ios?

It appears you have an iPhone 7. If this is correct, it may be a qualifying model for a Quality Program.

See iPhone 7 Repair Program for "No Service" Issues - Apple Support

If the device is a qualifying model, I suggest creating a full backup on your device, and contacting support.

Next steps for out of warranty devices is usually to be sent out for repair.