There might be spots where reception sneaks in, but but they'll be few and far between. I've only hiked bits of the JMT (Yosemite, JM Wilderness, SEKI) and my experience there and in the remote Sierra is there's no reception 99% of the time. Occasionally it will occur on peaks and exposed passes.

Primarily, a phone there is dead weight.

Cheers,

Originally Posted By Mudflap
I'm going to hike the JMT this summer and am wondering if there is cell phone reception there. I've never been, so I don't know. If there is reception I would like to bring my phone but if there's none I won't bother bringing it. Does anyone know?
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--Rick