It's no accident that Apple chose a yellow icon for its walkie-talkie feature. I dug out my old (2002ish) Nextel with PTT (push to talk). It was all the rage back then... :
@WeMissThoseDays: Remember 2003 Motorola Nextel i730✨📳 Motorola has been a leader in the space of technology and communications since 1940 with the invention of the first ever handheld walkie-talkie. ...
Nextel i880 - Review 2007 - PCMag UK
Motorola - i85s | Mobile Phone Museum
TOAN MAGAZINE — Throwback Thursday: Nextel/Boost Mobile Chirp...
Motorola i560 Rugged Nextel Phone Announced - ecoustics.com
Who here had this old Nextel walkie talkie phone? Remember the chirp? : r/Millennials
Direct PTT - The Nextel T320 is the full package. This model is a Smart- Radio with PTT & 2-Way Manage your entire fleet from your palm with full GPS Tracking and Mapping.
Sprint adds first Android walkie-talkie phone – Orange County Register
Nextel BB 8350i Mobile Phone, Walkie Talkie - China Nextel and Walkie Talkie price | Made-in-China.com