I dropped my nokia mobile into water & now it is just a black screen does anybody know how I can fix it?

Take the memory card out... Let The phone AIR dry... But if it isnt good in the next couple of days, I Hope you have phone insurance, because it is not going to work, you are going to need a new phone... I know because I had this SAME PROBLEM TWICE.

I doubt it can be fixed.

If you're really lucky, when it dries out it'll work again on it's own, but I don't think so.

The memory card should be OK if you've taken it out quickily.

Tip :- Don't use your next Phone over water, accidents can happen.

Last time I checked....dropping any electronics into any type of liquid...including water wasn't good for them. You probably need a new phone. When you get the next one...be more careful with it.

memory card maybe ok but your phone has gone to phone heaven