So at time of writing a number of high end phones are available with 24 or even 40 megapixel cameras on them.
Assuming good conditions, (good light, still setting, tripod?!) What would be the largest practical size print, for viewing in a gallery, could you make from a 24 or 40 megapixel phone camera?
Note: I can use a rule of thumb and take the number of pixels across divide that 300dpi to give me the number of inches. However once we get down to 40 mp with a lens less than 5mm across, I imagine other artifacts (sensor noise, lens artifacts etc) come to dominate and therefore limit the practical size.