Called my cell again today. I do not answer unknown callers. Uses my airtime if I answer and do not know the person anyway. I think it even deducts for the call going through because I had less time after it ringed. Have no way to block unknown callers and this can get expensive. Change my cell number if it happens much more. My cell is only for emergencies. I am 60 and do not use my cell for anything other than power outages and things like that...the reason it was on today. A storm came through.