You probably would not be able to get my free ISP. But it does not matter, select an ISP for dumb modems, the cheapest [it's only a backup].
Speed is not a problem with modems. Even a 33.6 modem is way enough for intraday data feeds. This data is compressed and requires very little bandwitdh.
It is not bandwidth the issue with ADSL and Cable, it is the fact that you need the connection active and stable for long period of time.
I used a simple 33.6 modem for months without any problem [but occasional and annoying disconnections].
You would need many, many symbols with level II active to even start to have a difficulty with a 33.6 modem.
Having a backup is important. It is better to be sure you can get out of a position even if your cable/adsl ISP is down. Of course, you should be able to call your broker, but it is better to have more ways to get out of trouble yourself.
vpiNeo
PS : don't get me wrong, after trading, cable or ADSL is much better than a dumb modem, to do research, go on the internet, download programs and updates etc...
But for the actual trading, 33.6 dumb modem is enough, that's all [as a very good backup].