First off, I am new but I have used the search feature. ;)
Secondly, I've gotten the 8700g working as modem by following the steps in the FAQ here. I've experimented with various adjustments also mentioned in the threads (error compression on/off, ip header compress on/off, connection string, etc).
Having said that, no matter what settings I choose my BB-as-modem speeds are unbearably slow. Bandwidth testing is reporting 40-60kbps down, but in reality there is latency on top of that and it's very slow and nearly useless to me.
Can anyone confirm (or deny) that I am only getting GPRS speeds? The BB itself is clocking in at twice as fast, so it's not my reception or location. I have a feeling either it can't operate as an EDGE modem and/or TMo has somehow hobbled its performance.
Could it be that it's not a dedicated wireless data card, nor designed with the modem function as it's primary task? Or that it still has to dedicate some of it's bandwith to monitor the phone network? I don't know but I do know that it's definately not going to match an EDGE capable dedicated data card.
I regularly tether my 8700g as a modem. And I regularly leave the connection active for hours on end. Recently I downloaded a pretty big podcast file using the link, at an average data rate of about 80kbps. I followed the FAQ configuration without changing any recommendations.
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I never manually set any modem speed, but Windows reports the connection as 115.2 kbps. Looking at my modem settings, I see that "Maximum port speed" is set to 115200.
I adjusted my speed up to 921 via connection properties.
Here you will open up in the general tab, click the configure button and there will will see a drop down menu allowing you to choose modem speed.
8700g hobbled as a modem? 
