22 Caliber handguns disguised as cell phones These phones are currently available overseas and have not yet surfaced in the United States. Beneath the cell phone face is a .22 caliber handgun capable of firing 4 rounds rapidly by using the standard telephone keypad. We ask that you be patient if a security person asks to check your cell phone or turns it on to prove it works. As you can see, they have good reason to request this.