Samsung ace is the dumbest "Smart" PHone there is - is an understatement. I have been using this piece of junk for about two months now and it is the worst combination of phone and operating system you can ever get.
Phone freezes all the time. Forget surfing the web and checking emails - this phone cant even make and receive normal phone calls properly.
The lag -delay when you press a key and the point where the key actually responds is way too much - something like working on a 20 year computer. MSFT did a poor job on the windows mobile operating system, while Samsung did a half-*ss job on the phone. The only reason I bought this phone was that it works on GSM network and I travel a lot out of the country. But the performance on this phone has been below ordinary at best. Would not recommend this to anybody. Hope they come with a better operating system for this phone atleast.
Worst phone ever.
There is a update to WM6.1 available now. http://www.samsungmobileusa.com/i325/upgrade/ Try this and get GPS enabled. And... close apps via the taskmanager to close them really. Otherwise you get the freezes as the RAM is full. I have the ACE since March and it is working fine if only the needed apps are running.