Im being using loop mobile for more than 2 yrs post paid and 4 yrs billing, and I found it most promissing, never over charge, hardly came accross any problem, even in roaming area I provides us network that the best past that too at a resonable prise, on the other hand I use Airtel, which I found always over billed with me, with out my Knowledge simple one lines im happy with loopmobile call rate s and servise as per as billing is concerned