Kyocera KR1 EVDO router and iPhone - 3G on the iPhone!
It works great, after I power up the KR1, the iPhone quickly finds the WiFi signal from the KR1. I can use the internet through the router on WiFi and still be able to take calls. Plus I get more speed from 3G that I do from EDGE of course.
Next I will be upgrading my S620 to a U720, to get EVDO Rev.A, and the iPhone will really fly with WiFi through the KR1 (since I'm in Sprint's area). Will definitely be keeping my Sprint data service for this purpose.
lots of macs here, Mac OS X (10.4.10), 8gb iPhone