To cite package ‘phonenumber’ in publications use:

  Myles S (2024). _phonenumber: Convert Letters to Numbers and Back as
  on a Telephone Keypad_. R package version 0.2.3, ,
  <https://github.com/scumdogsteev/phonenumber>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {phonenumber: Convert Letters to Numbers and Back as on a Telephone Keypad},
    author = {Steve Myles},
    year = {2024},
    note = {R package version 0.2.3, 
},
    url = {https://github.com/scumdogsteev/phonenumber},
  }