Well for me on I'm on a family plan with my parents. I'm in my mid 20's so I could probably handle it on my own but they haven't made a big deal about it... yet. And so I've always just sold my phone and bought a new one with the contract and everything stays the same. This time around it's not as simple. Yes people are saying you're paying the same about but from this month to next month it won't be like that. Instead it will be $30 added to their bill.
Although I just called them and just said... I'm going to send you a years worth of payments upfront from selling this phone. Of course I don't think they believe me that I can sell my phone for as much as it essentially costs to get a new one. They never have. I don't know what they are thinking I'm doing instead.
Find out how much your specific line costs for access. It would probably be $40. If you elect NEXT payments for a phone with AT&T, your access cost usually drops to $15 for that line saving you $25 monthly.
I have 4 lines. 3 phones on NEXT. One iPad Pro. All on NEXT payments. My bill comes to $338 per month for 20gb data family plan. Without NEXT I would be paying around $430.