Spoof your calls, by using crazy call.
CrazyCall is the ultimate tool for making prank calls and fooling your friends.
You can change your CallerID, so when you call someone he sees the number you selected on his Caller ID display.
You can also change the pitch of the voice, deep, high and funny.
This is a great tool which generates a code for you . You have to call on that number and then robot will ask you the code , then write the code including hash example :#12345 and your call will be connected .
Enjoy and have fun.