Another suggestion to keep it. Fewer and fewer people associate area codes with specific areas anymore. I mean, I remember when Ohio had (4) total for the entire state and I knew which was which (419 - NW, 513 - SW, 219 - NE, 614 - SE). Today, Ohio has (12). Ask someone under 30 years old what area code "212" is and they likely don't know.
Regarding the many 2FA setups I have as well, my wife and I have had the same mobile number for close to 20 years and I don't want to lose it. In fact, a few years ago, my employer offered to pay for my mobile service and I didn't want to carry (2) phones, so I ported my number to the employer. If anything were to change at my employer, I didn't want to even risk losing "my" number, so I moved it back to the family's VZW plan.