As all iPhone users should know, when our phone is unlocked and a call comes in, there will be an option to Accept (green button) or Reject (Red button). But whilst the phone is locked, there is only a slide to answer button. Is there anyway to actually reject the call. I know that I can press one of the volume buttons to stop the ringtone and vibration, but the call is actually not rejected yet. If there really isn't a way, then I guess there should be an improvement on this. Any help would be appreciated! Thanks.