When I call other people on their iPhones it shows the wrong location of my phone number.

Hi! When I call other people on their iPhones it shows the wrong location of my phone number. Only problem is my phone number doesn't have my location correct. It has the correct state but not correct town.  So when I call someone who doesn't have me in their contacts, they have no idea where the call is from. How can I fix it?
Thanks!