Samsung Touch Keys :(
-Press too hard and it may exit you out of a message completely instead of just deleting one letter during texting.
-Press it too hard on your face in conversation and it hangs up.
-You cannot set the sensitivity so you're stuck as is.
-Sometimes I had to hit the menu key numerous times before activation.
I loved the look and camera of the U700 but it was just too much of a pain in the butt to use as it's primary purpose....a phone.
Shop for accessories specifically compatible with the Samsung SGH-E840.