Hi, my mum recently took the bull by the horns and got a touch screen phone, a Nokia Lumia, her O2 sim card was cut down to fit the new phone and its working fine, this was done so she wouldn't have to change network to 3 and keep her price plan. She has it set up for €20 per month, €10 is deducted for free calls and €10 credit left on her account for texts etc. She has sent 2 short texts in 10 days and her credit balance is now down to €0.93!!! Can anyone tell me why???