Addressing the OP: I bought a couple of Galaxy S7 in April 2017 used off eBay for about $300 apiece at the time. They were in perfect condition even though the seller rated them at 9/10. I've been completely happy with both of them. The wife was a newbie to smart phones at the time but now I can't get her off FB with all her friends. I love the camera! Especially the "panoramic" feature that lets me start at one side of a scene and sweep in any direction up to 360 degrees (it gets a little messy and confusing if you go past 360). I've got a hot spot that runs over its 15Gb high speed data by the 10th of the month. If the throttled speed is too slow to do what I need to do or if I don't have the hotspot with me, I'll switch on the phone's hotspot feature and continue on using it. I've thought about upgrading but why would I want to? The camera meets all my needs and I've all the apps I could ever want at my finger tips. I added a 32Gb micro SD card to store my pictures as the built-in memory can't handle a lot of images from the camera - like I have stored on the SD card. Here;s a link to an eBay search for the Samsung Galaxy S7:
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1311.R7.TR12.TRC2.A0.H1.Xsamsung+gala.TRS0&_nkw=samsung+galaxy+s7&_sacat=0I see the price way down from what I paid 3 years ago making them an excellent choice. I've never had any problems with either phone. I use this horizontal case:
https://www.ebay.com/itm/Samsung-Galaxy-S7-edge-HORIZONTAL-Carrying-Leather-Pouch-Case-Belt-Clip-Holster/143318013003?epid=1555703287&hash=item215e6b544b:g:Ed0AAOSwX8tdHOkrAnd keep the phone in one of these:
https://www.ebay.com/itm/Samsung-Galaxy-S6-S7-S7-Edge-S8-S9-Plus-Case-Silicone-Rubber-Protective-Cover/281663933443I found a glass screen protector for $1 at Dollar Tree. If I were to take the covers off the phones today, there wouldn't be a mark on them.
I highly recommend the Samsung Galaxy S7. Don't get sucked into any of the 5G hype for the next several years till after the providers build out their networks. I doubt if you'll ever be able to get 5G service while boondocking in the desert at Quartzsite. The range on 5G tower isn't nearly as good as 4G/LTE towers.