Oxygen wallet is an app where you can keepmoney by load such account in your wallet .in the wallet whenever your relatives or family is far from you and need money urgently by any how , and their balance is sufficient to withdraw anymore.This is the one option you have Oxygen Wallet send money quicly by using simple way.I think wallet have not any problem toward the technically, cellular operator is responsble for that.i used many time that wallet for money transfer and never get problem.