Kanu Surf swim trunks are the move.

Yes, they’re cheap, but the zippered pocket holds a phone securely and they dry fast. No need to spend $80 on a pair you’ll likely leave in a hotel bathroom.

The key is that rear zippered pocket — most Kanu Surf models have one on the back plus a side zip. Your phone stays dry and won’t slide out when you cannonball. Mesh lining is comfortable, they come in a hundred colors, and they’re usually under $25 on Amazon. They’re not fancy, but they work.

Chubbies and Patagonia make good trunks too, but you’re paying for the name and marketing