Hi, recently I have been getting the message when texting my dad saying unidentified subscriber so I googled and check things where what they were supposed to be and all the same as they should. I took the battery out and tried that twice. Tried deleting the whole thread of message and trying fresh nothing. I am clueless of what else to do. I can send text to others and receive text also calls so why is this doing this? Can anyone help here?