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.