I pay less than $68 a month, and that includes the cost of my iPhone 13 Pro. I have no need for a land line. So I'm paying less than $8 a month more than you are for ancient technology. Quite frankly, I can't imagine having to go back to a land line and a flip phone. But the savings and convenience for than pay for that small difference.
This morning I got about $3 off my grocery bill by getting digital deals only available through the store's app. And that's on just two items. I save the cost of time and money by making remote deposits whenever I get a check. I pay all my credit cards with my phone as soon as I receive my bill by e-mail that I read with my phone.
Apple CarPlay in my vehicles allows me to navigate anywhere I'm not familiar with through the map on my phone. My credit card apps allow me to receive instant notification whenever a charge is made, so fraud potential is significantly reduced. Vehicle apps allow me to remotely start them from anywhere. I can also open my garage door from anywhere with an app.
I can order goods from Costco, Walmart, Amazon, etc from my phone. When I'm traveling, I can look up camp sites if I have my trailer. I can look up CCW laws for each state, so I don't run afoul of the law. I can make motel reservations through various apps. I can monitor security cameras in my home. There is so much more I can do with my iPhone. I can even make phone calls with it! Like I said, I could never go back to the days of land lines and flip phones.
I have still most all those advantages from my landline. I work from home.