The Pants-A-Phone is a type of spy phone created by Sandy. It only appears in the episode "Spy Buddies."
The shorts look exactly like the shorts that Patrick normally wears, except they have a phone inside them.
Role in episode
When SpongeBob and Patrick are told to become spies, they go to Sandy's treedome where she gives them a series of spy gadgets, including the Pants-A-Phone. The phone is built into Patrick's Bermuda-shorts. It is used only for communicating with Mr. Krabs. After SpongeBob talks into it, it is revealed that if he wants to continue the call, then he must insert 25 cents, which SpongeBob later does.