You're stuck on a desert island for 5 days. You can bring 3 things What do you bring?

Dude, if I'm stranded on a desert island for 5 days, I gotta have my phone for tunes and, you know, maybe some SOS calls. A sick survival knife would come in clutch too. And of course, a massive bag of beef jerky for the snack game. Gotta survive in style. What would be your go-to items?