(This is taken from Whirlpool. You may have seen it there, but I am the guy that wrote it. This isn't copypasta 8) I've had the phone for 24 almost a week now, and here's the info dump. Summary: If you have easy access to a charger, or you're not in a 4G area, get this. It's much better than the SGS2 3G, and it's faster with HDPDA-DC. But if you're in a 4G area, it eats battery. Nomnomnom. The major visible difference is: It's slightly wider, and it's as thick as the BASE of the SGS2 3G – if you have a SGS2 already, you'll see that the battery cover actually comes inwards from the base. The SGS2 4G is the same thickness all the way to the top. MAJOR New stuff: 3G LTE 1800MHz – aka 4G. (well duh. That's the point) NFC (for Google Wallet, and other stuff – use your phone as a PayPass credit card, woot!) Significantly faster camera (seems to be as fast as the Nexus) Better designed back. This 'better designed back' is one of the best thing about it. If you have a SGS2 you will notice that the rear camera area is actually the proudest part of the top of the phone, and lens is exactly flush with the case. This means that, if you don't have a case, every time you put your phone down with the screen up, the camera lens gets scratched. Eventually, it turns into something that looks like this (photo taken with the new SGS2 4G) http://imgur.com/GYUaV However, they've fixed this. The camera area is no longer proud from the back, and the camera itself is actually RECESSED behind a tiny flange. I'd estimate that it's roughly .2 -.3mm recessed into the case. Just enough that the lens isn't going to get scratched, as long as you don't drag it through sand or something. Minor new stuff: Slightly larger capacity battery (1850mAh vs 1600mAh) HSPDA-DC (Dual Carrier 3G, so you get better throughput even if you're not in a 4G area) Samsung are now supplying in ear headphones. Here is a picture showing the contents of the box. Note that this is taken with the SGS2 4G, and is unedited. It's a bloody good camera. Geek Stuff: Phone Model: GT-I9210T Android 2.3.6. (Public) Facebook link to screenshot of some speed tests – you don't need to log into facebook to view this. Baseband Version I9210TDVLB1 Kernel Version 184.108.40.206-I9210TDVLB3-CL959878 Build GINGERBREAD.DLVB3 CPU Differences: iceborg on whirlpool mentioned that the CPU is also slightly different. The original SGS2 used the Exynos 1.2GHz dual core CPU, whilst the SGS2 4G uses the Qualcomm APQ8060 Snapdragon Dual-core 1.5 GHz Scorpion CPU. This is a prime example of one of the times where MHz does not give the whole story. I have a SGS2 running ICS here, _not_ Gingerbread, so this won't be an accurate comparison, as ICS is significantly faster than Gingerbread. However, in the interest of SOME sort of comparison: SGS2 3G running ICS – 4137. (CPU 5684, Mem 3790, IO 8475, 2D 590, 3D 3147) SGS2 4G running Gingerbread – 3722. (CPU 6005, Mem 3001, IO 6907, 2D 446, 3D 2252) Note that IO and Memory are significantly improved in ICS. It may end up being faster, it may not. However, a gut feeling says that it feels about the same. Rooting: The second post on this page explains how to root the phone. It is taken from this thread on xda-developers. Note that if you use the files on XDA-Dev, you have to install the superuser.zip file three times. This is expected. DO NOT INSTALL ANY ROMS FOR THE I727. Whilst it is VERY similar, It is a different phone. The front buttons won't work any more. You'll need to restore, or, put a generic rom back on it. Update: A user on Whirlpool reported that even WITHOUT changing the ROM, his buttons still stopped working. I have no idea how that happened. I'll make a new post about rooting this phone. If you DO root it, make SURE you do the CWM backup. That allows you to go back, no matter what happens. If you haven't, you'll need to use Odin to re-flash the whole original Telstra package. ICS: ICS isn't released for this phone yet. However, as all the Samsung GS 2's use the same UI and application codebase, there probably will be little, if any, delay between the release of the SGS2 3G and SGS2 4G ICS builds, as Telstra will be able to test them simultaneously. There is a Gingerbread source code dump on https://opensource.samsung.com and there's also one called 'I9210T_SEA' which I haven't investigated yet. is indeed the Gingerbread ROM for this phone. No sign of an ICS leak, either, sadly. Battery Life: Yeah. Well. I always knew it was going to suck. Whilst it's connected to 4G it's actually running 2 radios at once. That is always going to chew battery. However you CAN disable 4G on this phone (unlike a lot of other ones!) – Menu – Settings – Wireless and Network – Mobile Networks – Network Mode and set it to 'WCDMA Only'. That will give it a slightly better battery life than the SGS2 3G running the same things (.. that is an estimation, not a statement of fact, btw. The Snapdragon CPU is – apparently – more power efficient, and the battery is bigger) Custom ROMs: As far as I know, there aren't any yet. However, Samsung have done the right thing and released the source, so there's no real reason why people can't make them themselves. They've also, I must say, really turned themselves around with releasing source code. Whilst they're still not publishing GIT access, they are being scrupulous about releasing source code these days. Other Stuff: I'm treating this thread like an XDA-Dev thread. I've reserved two posts underneath here, and I'll create and update them with specific rooting and bugs issues as we go. I'm giving up - yet again - on Whirlpool. If you want to speak to an android dev, this is the place to talk to one.