This is one possible solution, but you have to purchase an app for it: Dual SIM cards - 2 ringtones - #3 by vowi
This is another one (for free), which I am trying right now, though I haven’t figured it out yet:
This is one possible solution, but you have to purchase an app for it: Dual SIM cards - 2 ringtones - #3 by vowi
This is another one (for free), which I am trying right now, though I haven’t figured it out yet: