My plan currently costs me $50/mo (my share of a 5-line family-plan). $60/mo for the first line and $10 per line. So 5 lines is $100 for the minutes or $20 per person. Then $30 for the data plan. Also have a global discount of 15% applied to the account through my employer which basically cancels out all the extra taxes and fees so it's very close to $50/mo in total cost per user of the family plan.
So it's technically $1200 over 2 years. I still have my unlimited LTE data too. I do not want to switch because T-Mobile is a worse service. Slower speeds, much less LTE available, higher latency, worse overall reception.
Also, I sell off my phone every year for about $300 and then buy the newest iPhone for $200 again. So I pocket back an extra $100 a year in the process due to the high resale value of iPhones. I am in the somewhat uncommon position where I can get a fully subsidized discount every year.
So for me each year essentially looks like this.
Buy $200 phone.
Use 12mo of service for $600.
Sell phone for $300.
End the year at a cost of $500.
Repeat.
I have done this for 5 years in a row now, so my total cost has been:
$1000 in buying 5 phones.
$3000 in 5 years of service.
-$1200 in selling 4 of the phones (I have to hold onto the last one of course)
So I'm at $2800 of total cost in 5 years and had the luxury of always having the latest phone hardware each year and an unlimited data plan to use it a lot.