Should I get an offer for BOGO iPhone7 from AT&T?

I'm already locked with a plan with my iPhone6, but I also have 2 family members that need iPhones. One iPhone5 just got wet so we're using an iPhone4. The other one is an iPhone 6 I bought refurbished 6 months ago and it's starting to act up (still paying for it). Two new phones would be great, especially if one is (almost) free or heavily discounted. I would be paying $20 more every month for my AT&T bill. Or should I just slum it until there's no resort? Your ideas are welcome.

Pay it off early, or wait till the end of the payoff contract. I will always vote to buy the phone outright instead of monthly. And would never do monthly without some sort of insurance or replacement warranty line AppleCare plus or SquareTrade.

BUY All IN NEW AND DUMP AWAY All THOSE OLD JUNKS.

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