Hopefully it was only her cellphone number... and not her ssn or any other personal information. A similar situation happened to me and I got my credit report and found 2 different collection accounts from MCI and a medical something or other....never having any medical bills unpaid or ever dealing with MCI..... I called them and oddly enough they just took it off after a serious of validation questions.... a friend of the family in the business informed me that a lot of the time they will just "mistype" a number or tie you to previous address and put it on your report....