Tripods: Keep your phone steady for sharp photo

Lenses: Expand your creative option

Lights: Brighten up your shots in low light

Remote shutter controls: Take photos without touching your phone

Grips and cases: Add extra stability and protection

Diffusers and reflectors: Soften and bounce light

External microphones: Improve your audio quality

Portable printers: Print your photos on the go

Hope these tips will help alot.