[QUOTE=WMFan85;2091770]I haven't ever held a 4.3" phone before, but I would imagine they would be bulky and cumbersome. QUOTE]
I think it depends on the size of your hands. If you are an average caucasion male, I would imagine it could be even go to 5" without the screen being too large for one handed typing. Acer is about to release a 4.8" pdaphone. If you are a petite woman, it might be more difficult to type 1 handed.
YouTube - HTC HD7S