How would you sell mobile phone services to someone fully committed to their landline?

"There are indeed people who are committed to a landline, even today. I will use families who are on a tight budget and cannot afford a cell phone for each of their kids, as an example. The selling points of mobile phone service include convenience for every busy parent. I would let parents know that they could track their child's' whereabouts through their cell phone while remaining on one of the affordable family plans offered by Spectrum."