Verizon has no interest selling V30's, zero, none. I was just looking at their webpage, and its on the last page of smartphones mixed in with phones from years ago like iphone 6 and free phones.
The best deal might be from Tmobile, with the BOGO.
1. you still get the $400 deal from LG, as that is LG's promo
2. Tmobile sends you a cash card for the 2nd phone, so $800 or $850 back within 6-8weeks so you can pay off the free one in full.
3. no silly monthly credits like verizon, that you lose if you want to upgrade again later
4. Tmobile has the V30+, so you get the free headphones too (or 2 headphones in this case), that you can sell
The only trickery is that I guess you need that 2nd line open for 2 months, but usually a 2nd line isn't that much to add on. So maybe an extra $100 for 2 months, and then you have a free V30+ you could easily sell right away for maybe $500 or so, just guessing .
So I guess with all that done, you end up with:
1. $400 LG tv for free (although if you are smart, buy from Costco and return for cash back in 90 days).
2. $400 net cash from the free phone after paying 2nd line 2 months
3. $150 net cash from 2 headphones sold