Your phone is sitting at the bottom of the lake, and the fix is pure stubbornness: empty the water with a bucket. In a run you fill the bucket by clicking the lake, warp to the drain when it is full, pour for Tokens, then spend those Tokens on skill tree upgrades so the next trip goes a little faster.
Keep that loop going and the water level falls through deeper checkpoints until you can grab the phone. Tokens and in-run upgrades reset when a run ends, while Gems and better lobby buckets carry into the next match.
