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Large numbers of gadgets end their life in water. Even if only for a few moments, this can do irreparable damage. To summarise, your priorities should be:

1. Quickly remove as much water you can with a towel or whatever else is to hand.
2. If the water may have got into openings such as the charging or headphone sockets, vigorously shake it out.
3. If the device still seems to be working to any extent, switch it off. If you possibly can, remove the battery.
4. Place it in a warm dry place such as an airing cupboard for 24 or 48 hours with any removeable covers off or battery compartment open.