julianmclean, have you tried a soft reset? I had to do that to get it to pick up the settings fully i think.
Since you selected the GPRS Test in that drop down, it shouldn't even think about connecting to the other one (assuming you did it right of course!)
Yeah, did a reset, but didn't seem to help. I know what you mean - strange that it seems to have both going on at the same time. The bubble actually says:
T-Mobile GPRS Test Connected
Does this mean that only the second is actually being used?