EDIT after 4 months of use:
Because once the proud owner of galaxy ace, I find it poor, the interface is the same, it runs well in normal times but it is often taken bugs, screen locks when someone calls, sometimes not drag the icon to answer. Sometimes it unlocks even alone in the pocket (unlock by sliding L to R) and call a contact by simply rubbing in jeans and accesses recent calls by pressing the call key green screen, it even manages to reach menus and do anything. It even happens that it opens a text message with a contact and written onomatopoeia friction again .... It may sound odd but it has arrived.
The battery her, do not talk, she is already dead after 4 months, she will discharge 60% to 0% at night, yet no special activity, the internet by 3G is not cut but it not consumed as much on other smartphones.
Disappointed by this development.
(I specify: Amazon and seller are not to blame, it is the quality of this particular model I critic)