Fortunately, there's this medium called Instagram, which allows us to post photos at a portion of the size. There's no reason for me not to improve my photos when they're thumb-sized. Especially when there are numerous apps that can easily boost an Instagram photo's quality.
It came as quite a surprise to me learn that the images I've been admiring for the past four months were all taken with Leslie's pocket-sized iPhone -- the same one I use to take photos of my kids every day with very different results.
When you want to make a mobile phone image smaller quickly, launch iResize. Why would you want to change the size of an image? There are so many reasons; to email it, to post it online, and/or to share it in social networks are just a few.