It's 10-21 today! Did you know that 10-21 is the radio code for “make a phone call?” The 10-21 Police Phone allows officers to make free and protected... | By Motorola Solutions | Facebook
Walkie talkie 10 codes : r/coolguides
10-Codes Are 10-7 - Lee Lofland
10 Codes EagleCommunications | PDF | Telecommunications