The Oppo Reno 2 is a stunning cameraphone for the money!
Testing out the new Reno 2 from Oppo and have to say the camera is pretty stunning for a phone costing £449. Compare against the 256GB iPhone 11 Pro Max (which has a smaller screen and battery, plus one less camera) and you can't begin to imagine what an extra £850 is getting you..
But a comparison against a flagship iPhone is more a bit of fun, however the price for such a good camera phone - and with such a nice screen to boot - makes this a phone to check out before jumping to a more expensive flagship.
I've just read your review, the 2 does sound like a good phone, I'm not so sure of the 2Z though with a Mediatek SoC.
Not sure about this for the various networks yet as I've not put my EE SIM in, or Three, where VoLTE is most essential, but it is on sale with EE so unless there's a separate build I would say it should work on EE.
I am using it with a Vodafone SIM now and it doesn't have VoWiFi support. Calls drop to 3G, so there's no VoLTE on Vodafone either.