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At my condo near Canyon Lodge in Mammoth, I consistently get 5 bars on 3G from Verizon. From what I can tell, there is no 4G yet in Mammoth. Does anyone know when it is coming?

Reception, both voice and 3g data is excellent in Mammoth (even works down by the Devil's Postpile) as well as in most of the small towns along the 395 corridor. I had an iPhone with AT&T and it was awful. At best (when no one was in town) it would barely work in only 1 / 4 of the places my Verizon Droid works. I'm convinced that Verizon has the best network not only here in Mammoth, but everywhere I travel too.

The reception at the mammoth library is fantastic. Verizon also gets reception at coldwater campground by lake Mary. In general I get all my bars throughout mammoth and surrounding areas. I have heard that when tourist come up to the mammoth area AT&T phones don't work well up there because the tower overloads and can't handle all the calls. Verizon has americas most reliable and fastest 3G network. In general Verizon and AT&T work very well in mammoth and bishop.

ATT has def. stepped it up. THANKS I can now use my phone with no worries about dropping calls! I love MAMMOTH and I love AT&T!

I was about to change to Verizon, but ATT must have put up towers in Mammoth. The reception up here is perfect. I've only had one dropped call and I think it was on the other end. ATT has really made an effort to give Mammoth coverage in town and throughout the residential areas and the ski area. 3 months ago I would have given ATT a very poor rating, but I just signed on for another 2 years...

Very good service. Plugged into my computer and fast internet also. Phone works most everywhere in Mammoth. (not roaming on Verizon) This is actually very nice Sprint service for being away from the city. Also my iphone ATT service is AWFUL! No bars, no service. C'Mon ATT. Spend a few bucks on your system up here. You've certainly made enough money on the iphone service!

No service over the xmas holiday, continually dialed out with full bars but no connection, even tried 611 for help but could not get out. Finally got service about Bishop area.

I arrived in Mammoth a year ago with AT&T and quickly switched to Verizon - AT&T's service here is awful, I was told by an AT&T rep that they only have one tower. The upshot is that when weekenders arrive the tower can't handle all the traffic and all calls go straight to voicemail. I have had two very bad experiences with Ed Shinto, the agent at the local Verizon store - so be warned.

Works just good enough. But when you really need service for that important call, you can almost always bet on it not getting good reception! and some times the time just changes to 2 hours ahead of the actual time making the alarm clock useless.

AT&T service in mammoth lakes is very bad. Number of bars and coverage is fine, but on weekends and holidays you can not place a call, send a text, or use data (based on 8 years and over 40-50 days / year). This weekend just as bad. Can not receive calls or text either (messages can take a day or 2 to get to your phone). So even if you have 5 bars, you won't be able to use your phone. Called AT&T customer service. Clueless! Over past 5 years, most people I know have switched to Verizon due to this problem.