I'm using Samsung Galaxy Mega Duos and use two SIM cards - one sim with very low charge for 3G connection (called SIM1) and the other with very-high fee (called SIM2).
I go to
Setting - Connections - Data usage to turn off 3G on SIM2 but the checkbox
Mobile data seems to be synced between the two e.g. if I check it on SIM1 and then go to SIM1 to turn it off, SIM2 is turned off too!?
My question: How can I turn of 3G for SIM2 but keep it for SIM1?