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the k550 its better since it has a slimer profile the camera its a more modern cybershot than the k750, both are great phones, but when it comes to bvuying it the 550 takes over with the screen a little bigger, flasheable to the 610 which is really good and it has a more modern look asweel as the phone itself is modern
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I dont like the keys of the k550.
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The keys of the K550 are a bit small, and so it's difficult to press them e.g. when you play a game. But in the same time, I like the design of the keys; it's match with the phone. I love my K550.
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I am do with the k750C , but for my idear a new one always get something special with it. May be the k550 can be good for you
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Like was there few times sayed - K550 is newer & better. Because of K750 has better camera isn't big plus. In that days everybody has K750 and I think it's good to be little original and take K550 ;)