Mikko Rauhala wrote:
On ti, 2008-04-08 at 10:22 -0400, Dan Staley wrote:
I have plenty of cell minutes (not to mention free calls between certain
numbers...) but I dont want to pay for a data plan....so I figure if I
wanted to, I could just have my phone call my computer and transfer data
over the line.
There has been talk of it (especially in connection to encrypted
phonecalls). The archives have a lot of it.
To summarize, you can't transfer very useful amounts of data over a GSM
voice call since we can't bypass the GSM chip's audio codec for those.
Obviously you can get some data through, but the highest anyone's gone
was IIRC ~1k using some kind of funky phonetic coding, but I believe
there was no exact reference to this either, let alone code (which would
be rather complex).
Maybe CSD is billed like a voice call. I never used it, but i don't
remember any special charges for that.
The Wikipedia article about CSD has some hints about running voice
modems via GSM too.
http://en.wikipedia.org/wiki/Circuit_Switched_Data
Regards
Tilman
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