Official Apple warning: iPhone owners should not dry wet cell phones with rice. Although rice can absorb a certain amount of moisture, the water also makes it sticky and swells.

Apple also advises against other known tricks, such as using a heat source or cotton swabs that could be inserted into the openings. Only patience will help – or an (expensive) repair by a specialist. mike.mike@mailonline.co.uk. Follow Mike on Twitter @mike_mike.