FIXED: "CONNECTION ERROR OR INVALID MMI CODE"

[Rafiq_Hirji]

I have got A55 and When I tried to load Prepaid Card then I got error "CONNECTION ERROR INVALID MMI CODE".

After lot of searches here and there nothing found then I turned-off "VoLTE calls SIM 1" option in settings ==> Connections==> Mobile networks.

Voila...... Card Loaded without any single error.

So if you are facing this error just turned-off this feature and see if your problem solved. If yes, please post in comments so it may benefit others.

Later, if you wish, you can turned this feature ON.