Just got the Bluetooth modem part of my T610 working. Now I can use my GPRS connection with my iBook if I am in a jam and need Internet access. Pretty cool, it is snappy too. I am still using the t-zones from T-Mobile. It is unlimited data, except that I can only use a few specific ports (80, 25, 110, etc). Port 443 (SSL) is blocked, so no encrypted traffic for me if I use that connection. That port is openned up only if I add the $19.95 Internet package to my account, but I don't use it enough to pay money for it. But, it is a great fallback if I need access in a pinch!