My iPhone 4 has just started randomly stopping me sending or receiving texts and calls. I can only fix this by resetting the phone. I have reinstalled latest iOS but still does it tried ringing apple but they wanted £25 for the info!!! Phone done it twice today
Ok I have left it a week or so just to see if it has worked. I tried resetting settings and this made no difference. I then reset by erasing all content and resetting, this seems to have done the trick. But remember to back up all your stuff to the cloud. Thanks Andy.