Can the photos taken by mobile phones take part in the photo contest?

In addition to some thematic photography, such as competitions that restrict which camera or lens to use, photos taken by mobile phones can also participate in photography competitions in theory. But the biggest problem is that many photo contests limit the number of pixels in photos, so if the camera attached to your mobile phone is high enough, it will be fine.

Take part in other competitions with the same photo, which is the same as the above question. If this competition does not stipulate that it must be the first published work or the only competition.