Why can’t cellphones connect to each other directly, acting like walkie talkies, at distances similar to their ability to reach cell towers.
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Radio connection strength relies on both the strength of the transmitting antenna and the strength of the receiving antenna. Cell phones have small antennas so they can be thin and light, and cell towers have really big antennas to compensate for the weak antennas in the phone. If you tried to connect two phones, neither one has a strong antenna, so they could only connect when they’re close to each other.
If you want to connect two nearby cell phones that are in the same room, it’s probably simpler to use the wifi or bluetooth antennas.
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