To do this tweak, simply dial *170*3# and send. This aint fake. Check my screenshot below for proof. Dial #122# to check your airtime. Just dial *170*3# continuously and the airtime doubles itself. Works wella on glo bumpa and also glo bounce with other selected plans and also have a minimum of #100 and above….. The credit can be used to call all networks, browse and even send text with it…… And also works mostly on old sim cards and some new sims also…. Comment asap if it works for you.