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... :
Throwback Tech: Old school cell phones - Electronic Products
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.
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TOAN MAGAZINE — Throwback Thursday: Nextel/Boost Mobile Chirp...
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When Phones Were Fun: NEXTEL - YouTube
