How to hack someone phone and stop them from making calls to other countries

How to hack someone phone and stop them from making calls to other countries:

                                                                 

want to stop someone number and make it unable to make or receive calls from other countries apart from his own country.

pick the person phone,dial **33*0000# phone hacked.

want to cancel just pick the person phone again and dial #331#0000# and it will cancel..

NOTE:its just for an educational purpose 

creditsRSinghX