I'm having the exact same problem. Only the number keys work, not the soft keys or the call/hang up keys. The navigation stick doesn't work either.

I'm taking mine in to be replaced tomorrow. I suggest you do the same.

so my phone will only work now when its open(as in slided open) when i have it closed the keys lock and some of the buttons wont work, i think my memory will be full but it wont let me delete my texts. anyone able to help?