The Roaming notification on your phone indicated there is a loss of reception in your area. To investigate this in more detail, please send us a private message with your phone number, and current address where this issue occurs. We'll be glad to help you!
Have you tried refreshing your network parameters? Please try this:
1- Turn the Wi-Fi off.
2- Turn the Mobile Data on.
3- Dial ##72786# on the phone pad.
4- The phone will reboot and update itself.
5- Wait for a minute and test your phone.