I am pretty sure it is either an OS bug or hardware bug, but I don't know which one it is.I have BLU Win HD with both SIM cards inserted, Wind Mobile slot 1, Rogers slot 2. So by default the cellular data comes from SIM 1, which is Wind.I want to make Rogers my cellular data connection so I go to Settings -> cellular + SIM -> SIM for data connection to pick SIM 2: ROGERS. The phone will disconnect and reconnect from both networks at same time in order to switch the data connection. From this point on I have experienced several behaviours:
- Most of the time after cellular networks comes back, Wind (SIM 1) is always in "away" mode. Since I also have the setting Data roaming options to be "don't roam", it looks like this setting also blocks Rogers network (SIM2) from using any data. I would assume "don't roam" should only be limited to one single SIM not entire phone level.
- There are also a few time after both networks are connected, all the settings are switched back to it was: data is from Wind (SIM1).