For my Note 4, I pay like $26 a month on the Edge plan, so your estimate is pretty close, but still a tad off if you're looking for savings. This isn't really a savings thing, unless, like you pointed out, you're willing to keep your phone past 2 years.
Right? Just trying to show the savings is SO minimal there's really no point to rushing out and grabbing a $200 phone before that deadline on that particular 1GB plan. Different plans, who knows?!?
No need to apologize to me. There are plenty of people who will ;-)
I know. Like those people that buy those $1,000 video cards. or those members here who buy new phones every 6 months.