Can knowing your ten-digit phone number ALONE allow your cellular device SIM to be stolen?
Like a lot of people, my landline has been cut down to minimal service because cellular service on a multi-function device is so useful.
I think it would have to involve at a minimum some social engineering at your phone company, but knowing the number would be a starting point. It would be helpful if they would share more of the methods used, so we could take measures to secure ourselves better.