What you have to do.
Before drinking start this app and lock the call and SMS for minimum 1 hr and Max 12 hrs, after this time the lock will be automatically remove.
If want to unlock before that.
If you want to unlock phone before the locking time, ask your friend/Colleague to send you SMS with Text "UNLOCK CNS" , once your phone will receive this SMS it will be unlocked automatically.
You can also use this app in your phone if your kids are playing on phone and you don’t want them to send sms or call anyone.
Note:- Next version will have whatsapp blocking and google hangout blocking :-)