Hi johnleovillasis,
Did this problem appear after firmware update? If yes, please tell us which firmware update.
We would suggest that you try:
(1.) Settings > Network & internet > SIM card> Disable and enable the SIM card
(2.) Settings> Network & internet > Mobile network > Preferred network type> choose "2G/3G/4G" again.
(3.) Power off your phone > reinsert sim card > turn on the phone
(4.) Turn on airplane mode > wait for 3 seconds > then turn it off.
(5.) Try using another sim card by a different operator
(6.) Try resetting the network settings: Settings > System > Reset options > Reset WiFi, mobile & Bluetooth)
If the problem still appears:
Please check your APN type:
Settings > Connections > Mobile network > Access Point Names > tap three dots on top right > Reset to default.
Settings > Connections > Mobile network > Access Point Names > tap the APN that has a dot beside it to access "Edit access point" > Screenshot this page and contain the "APN type".
Thank you 🙂
