I have a dual sim on my android phone (ASUS Zenfone Max ZC550KL) which works very well for voice/sms functions. To use a data plan, I have to select on which SIM card the data service network will be used.
My problem is as following: When the data service network is selected on the Koodo SIM card, everything works well. If the data service network is selected on the other SIM, I'm instantly disconnected from Koodo network.
I have tried several carriers, it is always the Koodo network who disconnects me if the data service network is not selected on its SIM. I have tried to put the Koodo SIM card on both slots, the problem persists.
Note that I'm using prepaid Koodo, and whether I have data or not in my boosters, the problem remains.
Any idea to resolve this ?
Best answer by Timo Tuokkola
"About the "dropping data connection if you get a call on any SIM", if your operator doesn't support or your location doesn't have 2G network, this situation would occur. The reason is that our phone doesn't support VoLTE and if one SIM is using 3G, the other SIM is forced to use 2G network due to hardware limitations."
Koodo doesn't have a 2G network. If the non-koodo sim is set to use 3G data that will always prevent the koodo sim from connecting.