Flow free internet with 0.00balance is possible 4 different way
1.Credit hack- Credit hack is possible but you can only get a maximum of $8000 credit daily.
2.Http Injector--HTTP Injector can be used to bypass flow's firewall and can be used to gain access to the internet using a different ip.
3.Plan hack-Flow data plan hack is possible but it is not easy to do and if you do purchase this hack am not responsible for any damage.
4.Apn trick-This is one of the best way to get flow free internet but yet it is not easy to find a apn that gives free access to internet