I wish it was possible to do direct phone to phone data communication, a bit like CB but for data. Of course the range would be limited because of phone batter

I wish it was possible to do direct phone to phone data communication, a bit like CB but for data. Of course the range would be limited because of phone batteries, but at least you would not require a large, expensive network of antennas. I have asked SDR folks about it but they're not convinced. Just imagine not having to rely on network operators for tiny amounts of data. Only a phone would be required, without paid subscription.