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ah, ring-back, of course! thank you so much! this one no doubt can at least save on phone calls: I can set it up with twilio, or even the cheapest Dellmont res

ah, ring-back, of course! thank you so much! this one no doubt can at least save on phone calls: I can set it up with twilio, or even the cheapest Dellmont reseller: ok, great... then yes, I could have a friend with a 'very old style' BBS kind of setup, but best would be an already made service Oh, wait I sec, I've got a possible solution here: the UK service ZEN cited by thinkingemote https://support.zen.co.uk/kb/Knowledgebase/DialUp-FAQs https://support.zen.co.uk/kb/Knowledgebase/DialUp-FAQs plus a callback triggered by a text message: form Ethiopia I send a message to a SMS in twilio, this will trigger an API that with a Twilio (or cheaper Dellmont) provider which will call ZEN in the UK and me in Ethiopia: then I need to answer with a modem (I need the proper hardware modem I guess..... uh. it's really a shame I cannot use my mobile phone!!)

throwaway984393 5y ago
It's technically possible to use a mobile voice channel for dial-up, but very difficult. The GSM voice channel bandwidth is 2400 baud, and it's a lossy-compression codec. In the best case you'd get around 1kbps. But you could try it... disassemble an old Nokia, hook the mic and speaker up to a circuit that regulates the voltage and resistance to that of a phone line off the hook, and hook that up to an old analog modem (or use some software to make your computer's sound card act like an analog modem and skip the line regulator). I'm sure someone has tried this but I can't find it from googling.