yeah, math be damned!!!! LOL!
Go back and read my post. You CAN upgrade every year AND it costs less than the $10/mo/line Edge discount. The $20/mo/line discount, no, that is a good deal.
If you can't understand the math, sorry, there is nothing more I can do to help you. I wrote it all out clearly, and honestly, this isn't even something I would label as math, it is arithmetic. And 3rd grade arithmetic at that.
How much less than $10/month? Forgive me for not reading the math since Edge wasn't really an option for me.
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