I'll totally get a OnePlus 5T as soon as possible. They officially support custom ROMs. 

Are OnePlus phones CDMA-compatible? I'm on Verizon

Mostly.
https://www.androidheadlines.com/2017/06/oneplus-5-supports-34-lte-bands-limited-cdma-bands.html

That's a link for the Oneplus 5, here's the Oneplus 5T.

Proprietary fast charging technology is a bit of a downer, would have been better if they just licensed Qualcomm's Quick Charge since the SoC supports it, (you can get QC compatible chargers cheap).

Continued quick charging is probably not the best idea since it will kill your battery over a long time. Use a simple charger when you can.

On the subject of charging: Battery Charge Limit [Requires root]

Which is based upon: How to Prolong Lithium-based Batteries

Tapping on the wifi name in question and tapping on 'forget network' should do that

However, based on his original post, he had to access a website to log in so the WiFi network in question is probably an open network (no password on the actual WiFi network) and he's probably going to have to clear the browser cache on his phone.  Or, at the very least, clear that particular password out of his browser's saved passwords.

It could be the WiFi network has cached his MAC address as an allowed device for a set period, not much you can do until it expires.

I am planning to buy Lenovo P2 due to its long battery life, any opinions?

My opinion based on the half dozen or so phones I've gone through:

1. Never get a phone that isn't rootable.
2. Never get a phone that didn't provide Dual SIM and MicroSD storage, (ie. not Hybrid slot).

As for its screen, sound quality, signal, robustness? I think that would matter most for me.

it's easy enough to find reviews of almost any phone on youtube or wherever

I found Umidigi S2 PRO, would you invest in it?

would you recommend it? what caught your eye?
Btw, what's the difference between the Pro & Lite versions?
(I'm not a fan of the bigger phones myself, but do need to replace my phone - I broke the screen...)

I think it's the best choice.

Two things:
1. Google is locking down its apps to certified devices, see here.  Make sure whatever you buy is certified by Google otherwise you won't be able to sign into your Google account and thus lose any functionality that depends on it, eg. Calendar, Gmail, etc.  This is especially relevant for phones whose main market is China, (excluding brands like Huawei, Xiaomi, etc who have a significant global presence).
2. I have phones that are years old, Huawei, Samsung, Nokia, Xiaomi, and now Motorola (Lenovo).  They all still work.
I bought a Homtom HT16, (made by the reasonably well known Doogee), it was cheap, it had good specs for the price, and it worked for what I wanted to do.  It has stopped working after 14 months, no longer turns on, no longer charges ... effectively dead.
This is OK because I don't live on my phone, I don't care if people can't contact me on it, they can still send an email or ring my landline.

You use your phone for business so you should be looking at reliability above all else.

The Umidigi S2 Pro apparently only has four 4G bands, (FDD-LTE: 800/1800/2100/2600MHz ... no TDD-LTE) ... this was the first thing you checked, what bands and topology your provider uses, right?

Just as an aside, don't expect any upgrades to the next Android version on an MTK based phone ... be surprised and happy if you do get one but never expect it.

... a headphone jack

I went from wired to wireless as soon as decent BT4 earphones/headphones became available, don't think I'll ever go back, the wires were a PITA.  I just make sure both devices are using apt-X.

2018 and I'm seriously concerned that there is no flagship smartphone with both a headphone jack and no bizarre hole in the display.

Except Samsung.

Samsung's a good enough option for me

I have quite expensive head- and earphones and I do not plan to replace them by worse sounding ones.

Exactly!  I have some pretty expensive IEMs from NuForce.  I also had some bluetooth ones I tried out, and they cut out unexpectedly for no reason (only while running or exercising), which is what turned me off of BT for audio.

kalos

Quote from: tomos on March 28, 2018, 05:30 PM

Quote from: kalos on March 28, 2018, 03:14 PM

As for its screen, sound quality, signal, robustness? I think that would matter most for me.

it's easy enough to find reviews of almost any phone on youtube or wherever

I know, but it may be hard to distinguish the trusted ones from ads. But I will have a good read.

For technology available in the UK, you could do worse than visit Expert Reviews - The latest technology reviewed by experts.  This web site is owned by Dennis Publishing, who also own the UK magazines Computer Shopper, Computeractive, PC Pro, and Web User.  The web site appears to offer all the reviews that were published in the paper magazines.  You have to wade through lots of adverts, but there's no other cost.

A little over your budget but maybe the Motorola G6 or G6+ (not the G6 Play unless it floats your boat)?

Dedicated uSD slot, available in single or dual SIM config, dual back cameras, reasonably vanilla Android experience (the Moto Actions/Display are actually useful compared to the usual "extras" you get), etc, etc.

Relatively new release, this month I think, so you might need to search for reviews a bit.

I have the G5+ 4GB/32GB and it has been a great phone.

Any rival for Umidigi S2 PRO?

I will eventually have to ditch my Xiaomi Redmi Pro 3. After recommendations here I bought it, which proved to be good, but it has a major lack, the lack of NFC, so I cannot use it to make payments.