I assume you mean DSL as short for Digital Subscriber Line, which is what you've been using to get a connection to the Internet, and doubles as a fixed phone number.
This was a stopgap technology, that allowed phone companies to offer a "high" speed connection, using the existing wires that gave you phone service.
It has been more than 25 years, that phone companies stopped using the "wire" to carry "telephony".
All phone calls over an "Internet" connection. So, it does't matter if you have a "fixed number" or a number as part of a bundle. What they don't tell you is that it all the services are probably going through the same wire.
This switched rapidly happened after the 1996 Telephony Act, which the phone companies did not fight, because they were doing the switch anyway.
I dropped my "phone number" 25 years ago.
I'm guessing you signed up for a package from one of the cellular companies, like T-Mobile, and they will be giving you a device that gives you an internet connection, along with a cell number (they can also provide a "fixed" number).
