However the 5 digit phone number is well discussed.
For SMS, this -> https://en.wikipedia.org/wiki/Short_code
As I don't know all that is installed on your phone, nothing may be wrong at all.
Okay so this is a little strange. ..at least from my perspective. Have Google and come up with very little so would appreciate help if anyone can. I woke up the other morning...open logs to phone other half and saw a name I am not at all familiar with in my log. A text message had been sent from my phone after I had fallen asleep. No record of the message in inbox just on logs. It was a five digit number not recognised when phoned. Can anyone shed any light on this? I have the number and the name . Not very technical so would appreciate anything. Thanks guys