Recently bought an O2 Samsung Galaxy Ace GTS5830. However, problems occurring already. The network is constantly dropping out with 'emergency calls only' appearing every time. I originally thought it was my twelve year old sim card being the problem. But I have tried the new sim card which was sent with my phone, and the same problem still happens regardless. Problems receiving text messages also happens...some take forever to receive and some not at all. Maybe this is due to the network problems, I'm not sure. Both sim cards work just fine in my old Samsung U800, so clearly the phone is having the issues. The Galaxy Ace is also using the latest software and Samsung updates are not needed when I check for new updates. Any help would be appreciated.