Service Contract Providers must register with the Department of Financial Services to do business in New York. If you're switching service providers and remaining in the same geographic area, you can keep your existing phone number.Can I do it without changing my number? There are numerous questions in the Provider Contract Statement and Certification (DOH4255) that are not applicable to every contract submission. You can always switch provider while keeping the same number. If you are moving to a new geographic area, you may not be able to keep your current phone number when changing providers. A service agreement is a written contract between a service provider and a client. Tell your new phone provider that you want to keep your number. They will take care of the transfer for you – they'll ask for some personal details. Want to know how to switch phone carriers and save money?