[Device Reviews and Information] LuxZg:
I've been hesitant about Jiayu G4S and had been looking for alternative in the price range for about 10 days or maybe a bit more. Reading this thread helped a lot, but also was a reason for me to wait. GPS issues, caller ID bugs, trojans, camera that isn't good, buggy official KitKat, this and that. I was kind of scared by things I've read in this thread to the point I almost bought another phone!

Now when I have phone in my hands, flashed it with that jiayupolska.pl ROM (to get rid of the Chinese apps/kbd and get an EU version), and while I do see these bugs they are much less of an issue than I thought. I was scared for nothing! Read on for more of my thoughts...

GPS could be related to WiFi / 3G connectivity, still testing, but seems to be the culprit. If internet connection is off GPS works perfectly (+/- 1m in real tracking).

CallerID is fine on my phone, maybe because I have so many numbers on +xxx (countrycode) already, but have noticed it only in one occasion so far.

There is Polish ROM for EU users (jiayupolska.pl, build G4SW 20140609-150354). Trojans should be absent from it, as are Chinese apps and keyboard and other unneedded stuff. And it's nice clean ROM, but with no real modifications.

Official JB is so good that I don't see much point of forcing KitKat anyway, and there are tons of custom comunity ROMs around if you really want one. And yes, all apps work fine on it, I've tried ~50 many of which are social stuff and cloud stuff.

Camera is variable, it's obviously great (or well, good-enough) hardware but needs right software for best results, but let's face it - no phone gets great pictures without flash in the middle of the night, even 1000$ DSLR has noise, so don't expect from 200$ phone with 1$ CMOS to beat it. On a sunny day (or in well lit room) pictures are great, and video is just as good. I actually had two "tests" with friends, once we took some group photos with my Jiayu and Galaxy S4 in the closed room, during night, with light from standard lightbulbs, and Jiayu had better photo without flash than S4 with and without flash. Also tested with friend from work against HTC One Mini 2 and photos were comparable, if not a bit better on Jiayu. That was in an office with medium lights (we like it dark ;) )

WiFi Display obviously works, and perhaps as pointed by Ouzo wasn't problem with Jiayu at all.

USB OTG works fine.

Notification LED light is only red/green/blue but it's still notification, and works fine with all apps, and all occasions, and with all colors. You can also use customization apps to play with it, but I've found no reason for it so far. If I could get an app that would offer real RGB (so I could get for example pink or cyan notifications) I'd probably use it, but I'm too lazy to keep searching through them (btw, if anyone has found something like that pls write ;) )

Both SIM cards are 3G capable and have pretty good speeds on it, on 2 different providers, and tested both microSIM and normal one (tested both with same provider, both are just as capable at the other one)

RAM is real, real 2GB. Still have to go beyond 650MB (1.3GB free) which is great

CPU performance is awesome, I got 27588 on Antutu test, no lag at all, all apps just jump out (I don't play many games though, but tested Carmageddon, works fine)

Battery life is awesome, 32+ hours and still 28%, and you know how you get with new phone, always trying this and that, setting up apps and downloading new ones, I did some GPS tracking 2x by ~17 minutes and so on, by no means a light usage, and have like all possible social apps on it (FB, FB msg, FB Pages, Viber, WhatsApp, Instagram, Twitter, ..., all running at once all the time, with 5 email accounts syncing mail/contacts/calendar... etc). I'd quote some good screen-on times, but have turned phone off while I did some tests so my stats were reset :P Plus you can get a cheap second battery anyway, so you could easily go out somewhere without power outlets for 4 days and still have your phone doing all you need. Oh yeah, and phone does charge to 100% even though green led is lit on 90%, probably due to settings in phone that 4110mV is top, but actually batery goes to ~4350mV.

Size is great, pretty narrow bezels, and it's actually a bit smaller than some 4.2/4.3" phones around. I use it with one hand almost al lthe time, even when riding on bike, no problems, and I'm not a big-handed guy. It's a bit heavier, but battery is more than 50% of weight, so that's what should be expected from a real 3000mAh battery.

Screen is great, way better than you'd expect from a Chinese phone of any kind, certainly way better than many more known brands in this price range.

Storage is as it is, 16GB, and user has 9GB + 4GB, for me so far I don't need SDcard but I'll put in 16GB one I have once I clean it from backups/files of my old phone. It can be repartitioned, though that's your own call, haven't played with that so far, but it is possible as witnessed by other users.

Dual SIM works as expected, no bugs or problems at all, calls, SMS, MMS, 3G, whatever. Good range of supported frequencies as well. Call quality is great as much as I've tested (and my second SIM is from my work where I do IT support, so I get plenty calls every day).

WiFi strength is great, I get good signal in places where previously I'd have none at all.

I probably missed a few points, and there are things I haven't tested yet

I actually think that opening post should be updated once more after 70+ pages of discussion, and so many new things that happened since last update. People tend to be lazy and read just first page and than last 2-3, so they skip a lot of good info in between.

Btw, I'm not saying it's perfect device, but for the money it's awesome. I've payed more for a Prestigio PAP4040 some 20 months before ordering Jiayu G4S, and while technology progressed in that time, I think much more can be credited to Jiayu for putting so many nice things in this device for the budget they had. I've played with many phones in the meantime due to my line of work, and this beats almost all of them, goes neck to neck with last year's top models from Samsung/HTC, and goes close to current top models from well known brands.

Enough of a rant :D I know I'm subjective, and probably look at some things through pink-painted glasses, but still... looks great for 195$ phone ;)