Network issues
I am having network issues whichever SIM I am using the network coverage will be low comparing it to other phones.
Incoming calls are not clear due to this issue .
iPhone 7 Plus, iOS 12
Settings > General > Reset > Reset Network Settings
Reset your Network Settings. Go to Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
If you see No Service or Searching on your iPhone or iPad - Apple ...