Why do prepaid packs have 28 days validity and not 1 month? Is it due to a TRAI order capping the maximum validity at 28 days or is it simply collusion/norm of the operators to keep it at 28 days?
If it's a TRAI order, what law/order is it? A link would be helpful.
If it's a TRAI order, what law/order is it? A link would be helpful.