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... :
When Phones Were Fun: NEXTEL - YouTube
Buy Motorola i530- Phone (Nextel/Sprint) Online at desertcartSamoa
Throwback Nextel! | Best mobile phone, Best mobile, Cell phone
TOAN MAGAZINE — Throwback Thursday: Nextel/Boost Mobile Chirp...
Michael Fisher on Twitter: "Even if you don't remember Nextel for its phones, you probably remember its advertising. The 2004 brand reboot from TBWA/Chiat/Day is my favorite marketing campaign of all time (