Stucked contact list Full of bug app   Simple phone number base contact list but username base accounting . if you delete a phone number from your contact telegram never delete it  also save new number of that person to your contact if changed  if you changed your number telegram let it know to every one have your number in phonebook  even you don't know them and don't have in your phonebook  if you block some body and that person create new Acount with same number   blocked number unblocked easily.
December 23 2016