zlacker

If we're talking cyberpunk dystopias, we'd have to resort to hand-soldered audio couplers that use our locked-down phones as modems. Once the next Android/iOS update detects and blocks unauthorized binary carriers, we'll have to steganographically hide our traffic in fake voice calls. Crappy baud rate, but good enough for encrypted text. Augment with sneakernet and local hard-wired networks running under lawns and dorm room carpets.

Although in this grim future where all communication is monitored and censored, people like you and I will probably be up in the hills in the rebel camps, and open networking protocols might be low on our list of priorities.

>>gary_0+(OP)
Most of what I talked about they've already tried to make happen.

>>gary_0+(OP)
You already can't run modems over the phone network anymore. Modern noise reduction algorithms helpfully remove as much modem data as they can.

>>gary_0+(OP)
> If we're talking cyberpunk dystopias, we'd have to resort to hand-soldered audio couplers that use our locked-down phones as modems

…and they will make us use lead free solder.

>>kuschk+5X
Now I kind of want to build one just for the challenge. Analyze what frequencies can get through, and reverse engineer the phone company's codec so I can send a pirate signal, like a phreaker of old.

Fun fact: You can no longer do such a project in software on stock Android. They locked down the voice audio API.