you cannot do “similar to their ability to reach cell towers” because cell towers have much stronger transmitters, and much more sensitive receivers. Phones will not be able to “hear” each other at those distances.
you can use Bluetooth and WiFi for direct links, but distances is limited, so you can probably just talk without using devices.
PS In cell phones, Push-to-talk functionality is done via Cell data or WiFi connection. Cell phones are not talking directly to each other.
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