I have a strange issue after upgrading my mobile plan to the Starhub 5G Mobile+ plan. I believe it is due to the connection to 5G. I noticed that sometimes the VoLTE symbol will disappear and when that happens I am not able to receive any SMS.
It happened to me after I switch to the plan. However, I was still on the 4G sim card. But after I received the 5G sim card, the problem persists, and I cannot receive any OTP from banks, etc.
I have to switch to 4G or restart my phone (the VoLTE will appear after restarting my phone), and messages will then arrive.
I swapped my sim card to the second slot last night and it seemed to be working fine, until after lunch. My phone was connected to 5G service but no VoLTE connected. Again I was not able to receive SMS. I had to restart my phone and it connected to 5G with VoLTE.
I wonder if anyone faced the same issue? Or does anyone know the cause and how to resolve this?