With the phone-hacking scandal still playing out in the courts, it should be safe to assume that UK mobile operators have put measures in place protect customers own voicemail inboxes. Unfortunately, thats only half true. We know thanks to an investigation by The Register, which showed that two of the big four carriers had neglected to close a loophole that allows nefarious third-parties to spoof a customers phone number and immediately gain access to their voicemails.