In 2009, I had an ATT phone and had service in the following areas: _ Gardiner _ Jardine - high on the North side of the Hill going into Jardine _ Dunraven near the East bathroom on the view (LOL) _ about 1 Mile North of West Thumb Geyser Basin (no kidding, my phone was plugged into get charged and started beeping receiving all of the missed calls and about scared me!) ; ) _ Old Faithful area until you hit the first turnout North of the cloverleaf _ West Yellowstone (from the 7 mile bridge over The Madison to West - on bad weather days, only from the Entering MT sign going West). It was plenty of coverage for me! Your best bet though, have your phone charging, on and the volume up, as soon as you hit coverage, you'll know! ~ Vicky -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20100504/62cf168b/attachment.html>