I wonder why partners will sit on their phones instead of enjoying the moment. There's checking the phone, and then there's foregoing proper interaction in favour of the phone.
Perhaps they subconsciously feel anxious about being insignificant in their social circles if they don't constantly keep up to date. Or the significance they feel get from being connected offers a respite from the insignificance they feel around the mountains that tower over them.
From the Peak District to The Rockies, I don't think I've ever felt insignificance if the face of awesome scenery. There's every chance I didn't get that far, instead stupefied by the beauty like in the second stanza of lil's contribution. I thought back to The Rockies when I read these lines in Orlando by Virginia Woolf:
"The English disease, a love of Nature, was inborn in her, and here, where Nature was so much larger and more powerful than in England, she fell into its hands as she had never done before."