Anyone having problems with their network dropping? I'm on o2 (N. Ireland) and at times my network just drops to no signal, it takes me to turn my phone on and off to pick up the network again. Looking at my battery usage and into cell standby over the past day i've been without a signal for 3 hours. It's definitely not the sim card as i've put it in my old phone and it works fine and doesnt lose signal ever. This cant be right should i take it back for a new handset as its only a week old? I absolutely love this phone by the way.