Here's how to test the strength of your cellphone signal at home

Cellphone Spectrophotometry: Turn a Phone Into a Functional Piece of Science Equipment (Science-hack Your Phone: Part 2) | Science Buddies Blog

phyphox: Using smartphone sensors for physics experiments

Spectrometer for Mid-IR, NIR, IR, VIS and UV - APE

A spectrometer is used to analyze a light source. The screen-to... | Filo

A Low-Cost Spectrometer Uses Discrete LEDs And Math