from their customers' own unrelated outside services? What's next, forcing hotel patrons to rent your cell phones for exorbitant sums? Fuck Marriott.
Goodness no! Go to the trouble of maintaining a stock of handsets for you to get your grubby fingers on, and a staff to hand them out and get them back? We'll just knock the handset you have onto our private tower, where you'll pay roaming fees that would make you think you were staying on a Kupier Belt object with a state telcom monopoly. Your telco will get their cut of the charges, so they'll pass the bill along, don't worry.
The rule on staying alive as a program manager is to give 'em a number or give 'em a date, but never give 'em both at once.