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Upper Pines Campground. 1 bar with Verizon vx6800. 2 Bars with work-issued Blackberry Curve I only turned the phones on in the evening to check for emails / messages. YMMV
Had surprisingly good reception at the top of Half Dome (8800 ft alt). Had to call my cousin at work to rub it in. There was another guy up there who borrowed my phone because he had no bars. I think he had T-Mobile. I am, however going to change from AT&T to Verizon as soon as my contract is up because AT&T gets almost NO reception in Groveland where our vacation home is.
No reception anywhere in the park. My hiking partner had reception in high spots like Nevada Falls but none in the valley (I think she's on a different carrier, though).
I went to Yosemite and right when I got into the valley service was there. It was Extended Network, my txting worked. The service was ok it was Golden State Cellular. It worked ok just at night sometimes if I tried calling someone it would say all circuits are busy it was ok.
I got decent ANALOG reception with my three-year-old dual-band Samsung phone when I visited Yosemite in August, 2005. I was standing in Curry Village. As one of the previous reviewers said, you may need to walk around a bit until you are happy with the reception.