How to Call in Bikini Bottom

This page is a tutorial on calling underwater. However, your phone is unable to preform this action. (which is why Patchy The Pirate writes letters instead)

Guide
All cities have an area code. Type "3422". The number becomes invisible. Now, type the numbers/letters to call.
 * BKN/256/415 - Bikini-Ukulele Metro Area
 * NKC/767/513 - New Kelp City
 * RBU/259/415 - Rock Bottom
 * PTV/347/549 - Patrickville, Sandyville, Eugeneville
 * PFC/123/987 - Other