[G3 Q&A, Help & Troubleshooting] Amb669:
I went from the S4 to the G3. Not quite the same as you, but similar.

Here's what I've found in the 4 months of using the G3.

My list of cons looks a little big, But they are small things in comparison to the Pros, I just wanted to share my experience.

I'm currently a proud owner of the G3 and despite running everything stock due to lack of development for my model (D852), The G3 at stock is still better than most other heavily modified phones.

G3 Pros:

~ Best form factor in any phone bar none, The screen size is perfect for the size of the phones body, Very compact for a 5.5" screen and 1 handed use has never been an issue for me on this phone. (My hands are about medium size) (This is my main reason for keeping this phone.)

~ The bezels on this phone are the smallest nicesest looking bezels on any phone out there. (Without these super skinny bezels we wouldn't be able to get this small form factor with this huge of a screen, Looking really good is just a bonus hahaha.)

~ This phone is probly the nicest looking phone on the market, looking at it from the front with the screen off. (with the exception of the grey bottom bezel, The grey bezel kinda wrecks it's super sleek sexy look. But it still looks really good)

~ Super sexy UI, Especially the notification menu on this phone is THE NICEST looking of any android device in my opinion. (Which is kinda funny considering the G2 had the UGLIEST notification menu out of any android device I've ever seen.)

~ 1440x2560p resolution. <--- This is the first resolution that I've ever seen where I feel it's a retina display (Everyones eyes are different), To my eyes this resolution is a REAL retina display, Meaning my eyes can't see pixels anymore, After owning a 1440p phone i can totally notice 1080p isn't even retina Although some would disagree. Let's not even talk about what steve jobs thought was a retina display hahaha, Your eyes would melt out of your head seeing those resolutions now days. Although I could see how an iphone can be a retina display... at 5 feet away... :p

~ You can install custom roms & kernels via bump method.

~ Extremely good standby battery life on my Canadian model (D852). (5h20m per 1% battery drain, From what I've seen most US models seem to only get 1-3 hours per 1% depending on the circumstances, But as you can see it can be a lot higher depending on the circumstances.)

~ My first battery cycle on my G3 was an impressive 13.5 DAYS with just under 3 hours SOT on LTE 100% of the time. (100% of the SOT was texting)

~ Screen on time is really good, At stock on my G3 I get a slightly less SOT than my S4 that was heavily modified towards power savings

(Using auto brightness with slider at 0 & optimized options on stock I average around 11.5h screen on time (most of my SOT is texting) over the course of 3-4 days on most cycles on my G3, If I don't do any webbrowsing.) (The webbrowser on this phone DESTROYS my battery life)

~ I left my screen on for a full cycle without touching it just to see what kind of screen time the device is capable of and it went for 15h35m screen on time, autobrightness was on with slider at 0. I also tried the same test with the only custom kernel that exists for my model (D852) and my battery life only did 10 hours unused vs the (11.5h avg) I get WITH usage on the stock kernel. Lack of kernel support on the D852 does make me consider trying another phone.

(It also might be fair to say that most other users average 3-5h SOT, which I don't even know how is possible to get so little unless you were playing a game the whole time with max brightness, but it's reality for some. But just know you can EASILY exceed 3-5h SOT)

G3 Cons:

~ If I turn my brightness above 50-60% I can start to see little squares on the screen, I usually run really low brightness and just noticed this a couple days ago. (I will likely RMA because of this.)

~ The glass on this phone is prone to coming slightly lose from the screen around the edges, Just enough to make the glass stick up higher than the actual bezel itself, Just like the S4's screen. (This of all things pisses me off more than anything) (I exchanged my first G3 back to the carrier for a new G3 because I had this issue & my phone was really hot, The second device was solid until I noticed the little squares on my screen as mentioned above.)

~ Can't fully disable touchboost. (This phone is clocked at 1.5ghz on 2 cores when your finger is touching the screen because of touchboost, So just to swipe your screen consumes ALOT of power and causes lags due to cpu ramping up on the stock cpu governor) (Even with a custom kernel I was only able to disable touchboost on 3 of 4 cores on my D852, So even when I'm texting on my phone my cpu has to hit 1.5ghz on 1 core to press a letter on my keyboard which is BS, And if on stock kernel it ramps up 2 cores to 1.5ghz just to type a letter) (touchboost is one of the biggest causes for keyboard lag & battery drain when the screen is on.)

~ Signal reception is not near as good as my S4, My S4 was always full bars, This phone is lucky to have half my bars. (Calls are nice and clear without any background noise, Probly the best I've ever heard on any cellphone so far but the data connection is a little flakey)

~ The top bezel is very uncomfortable on my ear when making a phone call. (I always find myself using speaker phone a lot because of this) (Despite the S4 having the same bezel design, The S4 didn't hurt my ear)

~ I have a buzzing sound in my left headphone IF there is no audio playing AND the cpu is under load.

~ This phone isn't as responsive as my S4 was. (One of the reasons for this is the combination of the stock cpu governor + touchboost, The stock cpu governor doesn't ramp fast enough for the touchboost causing a noticeable delay everytime you touch your finger to the screen while using the stock cpu governor, Especially noticeable when scrolling web pages on the web browser.)

~ Web browsing is alot slower than my S4 was, Sometimes I even get "Connection timed out" while trying to load web pages on WiFi, LTE, HSPA+, HSPA. All networks appear to be affected. (Using stock browser, Haven't tried other browsers yet)

~ The webbrowsing on the stock browser drains battery REALLY fast. (But it's the only 2k browser, Atleast it was the last time I checked) (I believe LG's sandbox security is to blame for the stock webbrowsers bad battery life/bad performance)

~ Very little development on lots of models, It seems unless you get a D855 you probly won't get much development. As of right now for my Canadian D852 there is only 1 custom rom and only 1 custom kernel in existence for my model. (Both of which are the same or worse in battery life than stock)

~ If your really into battery savings and are stuck with a crappy model like my D852 model the only custom kernel for my model is the Rin kernel and that makes my phone die FASTER than stock kernel even when it's completely tweaked for max battery life. Completely tweaked Rin kernel gives me same battery life as stock kernel but with TONS of stutters & lags (Stock rom + stock kernel gives me the best battery life & performance on my D852)

~ Phone is hot out of the box without disabling a bunch of things.

~ Color is washed out. (Especially the color red, Red looks like orange that is trying to be red, like it's almost red, but still orangeish.)

~ Color is REALLY washed out at high brightness. (At really high brightness black isn't even black, it's grey)

~ (I don't know if you would call this last one a con, But it sure is disappointing none the less) All the space on the inside of the phone to the left and right of the battery is hollow plastic that coulda been used for a much larger battery, But because this phone was made in korea it was designed this way to accommodate the TV antenna on the Korean version, In the non Korean version it's just air filling this same space.