I have two free unlimited lines going unused.[1] It would be great if, once these MacBooks are available (hopefully sooner than 2028), I will be able to put one

I have two free unlimited lines going unused.[1] It would be great if, once these MacBooks are available (hopefully sooner than 2028), I will be able to put one of those lines to use in one. [1] Sprint/T-Mobile free line offers in 2020 and 2023