You're at home and don't want to be reached by your colleagues from work? Just temporarily block them!
You're at work and don't want to be disturbed by your friends? Just temporarily block them!
Block what disturbs you and enjoy the relaxing quiescence - while knowing that the people important to you are still able to reach you.
stonewall makes use of iOS 10 new CallKit framework - so we really can block calls, without making any changes in your address book.