I don't use access connections to manage the bluetooth connection on my thinkpad. I just go down to the bluetooth icon on the lower right and double click it, then my phone shows up with dial up networking and I right click on it and click connect. I don't specifically put my phone into internet sharing mode - on verizon it's called "Modem Link" - I don't use that. I use the dial up networking bluetooth protocol - see this thread
http://forum.ppcgeeks.com/showthread.php?t=23522 , post #12. I do use access connections to manage my wireless connections, just not my bluetooth dun. Hope this helps.