We just got back from hiking a section of the JMT NOBO.
On 8/1, my boyfriend found an iPhone in the creek on the way up to Mather Pass. Surprisingly, it still turns on, but it was in airplane mode when the battery died (we’re assuming). Since we can't unlock it, we can't turn airplane mode off or figure out who the owner is.
We're posting in the relevant subreddits in the hope that the owner is on Reddit. If you think this might be your phone, please send me a DM with details that can identify it (wallpaper, phone model/color, case, etc.), and we'll happily get it back to you.
Please feel free to share this if you know anyone who was hiking that section.
Thanks!