Selling on credit is different than offering a loss leader and making it up elsewhere.
If they are "selling you the phone on credit", then it would be obvious to require (a) in bill, separate items for the telecommunications and for the phone payment; (b) in advertising, note the full price of the phone, including the all monthly payments+interest; (c) when the phone is paid in full (24 months?), then stop charging for it... rather than continuing the same bill forever.
If they are "selling you the phone on credit", then it would be obvious to require (a) in bill, separate items for the telecommunications and for the phone payment; (b) in advertising, note the full price of the phone, including the all monthly payments+interest; (c) when the phone is paid in full (24 months?), then stop charging for it... rather than continuing the same bill forever.