In reply to Rick Asher: No phone signals in most places in upper Khumbu after Namche. None at Cholatse BC or higher. Nearest connection is internet via Everest Link, the Khumbu internet system offered by most lodges.
Thanks, I'm trying to gauge if i need to take a garmin in reach as I had phone reception on ama dablam in 2013 throughout the upper camps. It was a bit sketchy at BC but i suppose Cholatse is quite far up a different valley system in dead ground from Namche.