I have been using wham app since junr 2017 . daily we can get 25 whams for opening 5 whams 20whams for viewing advertisementsThey were giving it regularlyBut the problem was in redemtion for non shoping users can only redeem through gift cards which used to un available every timeThis was so irretating while using this appGift cards made avilable at some unpredectable timeBuy if u shop through the app codes and upload the bill you can easily get prizes quoted in appSome of the prices were nike bags , ear phones ( branded) , redmi mobile, etc.Comming about usefullnessIt was usefull to users who do ahoping regularly so that they can shop through app codes and upload bill and eligible to pick prizesTank u friends!