A phone camera’s EXIF often shows the actual focal length, not the 35mm-equivalent. Because the sensor is very small, the crop factor is large, so the equivalent focal length is much longer than the raw number suggests.

To estimate 35mm-equivalent focal length:

equivalent focal length = actual focal length × crop factor

Example from the answers: a 5mm phone lens on a phone with about a 7.6× crop factor gives roughly 38mm equivalent.

Important: the focal length itself does not change with sensor size; what changes is the field of view. Smaller sensors capture a smaller portion of the image circle, so the view looks narrower than the same focal length on full frame.

A more exact way to compare is by field of view, which depends on both focal length and sensor size. In general, typical phone cameras often land around roughly 30–50mm equivalent, depending on the model. That means many phones are only moderately wide, not ultra-wide.

So if your phone says 5mm, you need its sensor size or crop factor to know the full-frame equivalent accurately.