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Step 1: What you need
2 phones (dont use cordless, well you can if you want...)
2 phone cords
4 alligator clip leads
1 300 ohm 1/2 W resistor
1 9V battery
2 phone jacks
Step 2: Connect your phones to wires and jacks
Then we connect the other ends of the cords to our phone jacks.
Step 3: First alligator clip
This part can mess up if your phones work so make sure the alligator clip is on right.
Then take the other end and clip it to any end of the 9V battery.
Step 4: Second and Third Alligator Clip
Take the other side and clip it to one side of the ohm resistor.
Take your third alligator clip and clip it to the other side of the ohm resistor.
Like before now we take the other end of this alligator clip and clip it to the red wire on the other phone jack.