To elaborate how easy this is: I did this recently in my own number after loosing the sim card. I just called up the phone company and convinced the customer s

To elaborate how easy this is: I did this recently in my own number after loosing the sim card. I just called up the phone company and convinced the customer service agent to assign the number to a new sim card I had just bought from the petrol station near my house. I provided no authentication for this and they had no way to prove I was the owner of the account. Took all of 5 minutes to pull off.