Hi, & welcome, can't really give an advice here, but wanted to say I well understand the difficulties you face, as I read the "2-3 mobile operators" oligopoly paragraph - it's basically like that in some countries, like mine as well: there are several Internet providers but they all have to buy traffic from a government company (itself a provider), so there is no real competition there. That said, I hope you come with a solution and wishing you all the best.