There are many good apps which provides genuine talk time and offers like mcent, earntalktime and there also other apps which are really fake.
Among all the fake apps taskbucks is the boss its such fake app that I have tried all the offers in the taskbucks and till now I even did not get one time recharge rather a time waste and its takes so much time to load new offers and also it shows that even I have completed the offers it says you still need to try it and so then I uninstalled because the worst app with the worst offers and no talktime. I just say not to try it.