I have a Palm Treo 680/AT&T smartphone and Telenav GPS subscription for my car. This requires a separate $100 GPS reciever (GlobalsatBT-359) plus $9.95/month for unlimited trips= low setup cost since I have the phone anyway and carry it on bike rides.The reciever is quite small, only about the size of a larger cyclocomputer like Shimano Flightdeck. The gps reciever works by Bluetooth thru the phone and gives very nice voice directions and a pretty detailed color display onto the phone's screen. It should be easy to adapt this system to my bike and listen to the voice directions on speakerphone, but I'd like to find a solid secure phone mount for the bars. Suggestions? I like to ride in cities but having GPS in cities I'm visiting would be great. Has anyone tried this? Above system is also readily available for many other smartphones too.