Before allowing a locksmith to do the job, always get an estimate for all the work and replacement parts. For emergency lockouts, such as when you get locked out of your vehicle, a legitimate locksmith will provide an estimate of the total cost of the work on the phone. Ask if there are additional fees before you allow having the locksmith do the work. Some companies may charge an extra fee for a response to a service request in the middle of the night. You should also ask if there are charges for mileage as well as fees for a service call. If a locksmith arrives but provides a price that doesnt match the estimate you got on the telephone, do not let the locksmith do the job. Be careful about blank authorization forms and never sign one.