Iphone 4 water damage. Is it ok to use?

Dropped my iphone 4 in water and tried the rice trick and stuff, and it seams to be fine except the home button won't work. I've turned on assisstive touch so i can still go to my home screen through that so it isn't much of a problem (although it is rather annoying!) but is it ok to carry on using my iphone as normal or will it just get worse? Thanks!

Added (1). also anyone know how much it would cost to get repaired? Thanks

Added (2). also anyone know how much it would cost to get repaired?

The damage is already done. As long as you don't drop it again you should be alright.

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