When i leave the country, i have to turn on data roaming in EXACTLY the steps below.
1. Go to Sim Manager and turn on Sim 2
2. Go to Mobile Data and choose Sim 2
3. Go back and go to Mobile Networks and turn on Data Roaming
If i mix up the steps, i get charged data on Sim 1. I have been charged twice and it has doubled my bill each time.
If i switch and Sim2 recognises my local network (land border) instead, SIM 2 now is roaming in my local network. So i have to guess when i can turn it on.
Coming home (land crossing), if i switch to Sim 1 and it happens to still be on the overseas network, i get charged as well. Because data roaming needs to be on for Sim 2 to work. So i have to guess when i can switch.
Now here is nearly every other brand's data roaming setting Sim 1 - Data Roaming on or off
Sim 2 - Data Roaming on or off
Solves all the problems, no chance of a mistake and no guessing!
Turn Data roaming off for Sim 1. Never get into roaming data by mistake!
And i can select "Switch sim for data" and i dont ever have to choose a sim card for data when overseas!
Q&A but Edwsy, you just need to call your service provider and switch off roaming for your sim 1.
