Yes you are right that it is useful for short calls only as for long calls you have to watch a lot of ads. The call charge depends on the country , like if you call in USA it will cost you 70 credits per minute and a call in India costs 260 credits. You can earn 10-100 credit on per click on the spin wheel and you can earn upto 11000 credits for referring a friend. But still this app is worth . I am also using this app for a while.
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