GTB is doing wonderfully well since i opened it on my phone dialing*737# over 7 years now during my undergraduate days in EKSU,no NEPA bill or unnecessary things asked, opening an account with them was seemless and I used it often in my undergraduate days with no hanging transactions or any complains at all.
GTB is also accountable with my funds cos I get alert from time to time and no unnecessary charges removed.
Up till present, I am still enjoying their services and their app works perfectly well on my phone,I buy data, airtime and pay for my startimes subscription.