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Good ways? Well, this may not be a good method for cellphone pics, but I use either the Median or Despecle filters (under Noise) in Photoshop to get rid of annoying grain in photos. It works well if you take large raw images and are ready to resize them to near completely eliminate the grain after using the filter, but when that's not an option, you do lose small details or are left with some grainyness (see pic). You could also use a combination of Gaussian blur and Unsharp mask to get similiar results, but that tends to take more time and I'm lazy. Also, setting the grey point (Levels) helps you correct the colours (see other pic) but that's not really relevant to the grain question.
In case you don't have Photoshop, I guess you could still use Gimp's median filter, though that requires some fiddling with the settings AFAIK.
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