Step 1: Get to phones
( We have only tried it with a Razr and a Sync )
Step 2: Call
This shouldn't be to hard, unless your like my brother. =)
Step 3: Call again
Step 4: Link the calls
Now for the fun, but loud part. Put it on speaker phone(if you have it. It doesn't make a big difference, it is just louder.) Make all the noises you want. It is fun to make high pitch noises, it sounds like a Ring Wraith. Have fun!
This is my first instructable, so tell me what ya think.