yep. Dual actually seems to be the best for me, dont know why (it switches to 2.5G when 3G isn't strong enough). I dont travel but China Unicom is known for not having the best service so that MUST be the main culprit. I really dont use the device as much as Id want to
will have to wait when I travel next to give it a fair trial. or maybe put in another SIM from another provider...