[Galaxy Note GT-N7000 Q&A, Help & Troubleshooting] Jade Eyed Wolf:
In short, GSMarena got it sorely wrong. The internationally available version of the Note, with the Exynos chipset, most certainly does not support LTE in any shape or form. It should also be mentioned that Verizon also uses 700MHZ LTE as well, but both AT&T and VZW use totally different blocks within that spectrum space anyway. So, I would find it strange that GSMarena may possibly claim that not only does the Note have support for 700MHZ LTE, but also every possible carrier block therein. Seems unlikely to me...

There are however carrier specific versions of the Note based off a completely different Qualcomm Snapdragon chipset designed to work on very specific LTE networks in other parts of Asia (mainly in Korea), and AT&T is rumored to have commissioned Samsung to build them their own specific LTE version of the Note as well. HOWEVER, I would fervently recommend AGAINST buying any kind of device commissioned and built specifically for any particular carrier. ALWAYS buy unlocked devices. By buying unlocked equipment, you are taking power away from the carrier that they would otherwise have over you when it comes to your consumer choice. Not to mention all the benefits and the freedoms you should enjoy by owning your own equipment, free of any carrier imposed limitations, bloatware *ahem*CarrierIQ*ahem*, and whatever other diabolical things carriers will inevitably do to our precious equipment.

Anyway, I'm getting side-tracked here...

To get your Note fully functional, and running optimally on AT&T, it's not quite as simple as just popping your SIM card in and off you go...

The three basic things you need to do are as follows:

1. Make sure you have the correct account provisioning.

2. Configure and use the correct APN('s).

3. Disable Fast Dormancy.

I'll cover these in more detail below, but first of all I need to clarify something: the Note supports 21mbit HSPA+, which if you want to call that 4G, OK fine. Personally I try to avoid marketing catch-phrases like "3G" and "4G" altogether, so henceforth I shall refer to the Note's mobile connectivity by what it actually is: HSPA+

Now, before you're able to fully take advantage of HSPA+, you'll need to make sure that your account is properly provisioned for that feature, otherwise you'll run into a virtual speed limit which will keep your device from reaching its full speed potential. So, in order to check that you have the correct provisioning on your account, you should call in to customer service and make sure you're on a proper 4G (not LTE 4G either!) plan. Ask them if you have the correct SOC code. In my case (grandfathered unlimited data user), my SOC code should be "HSDPB." If you're on a tiered plan, it'll be something else. Either way, you need to be on a 4G plan of some sort.

"Ok, how do I do that then?"

Easy. Go to you local store and get the IMEI from a similar Samsung device (from a connectivity standpoint anyway), like an Infuse 4G, or a non-LTE Galaxy S2. From the dialer, enter in *#06#, and the IMEI should show up. Make a note of that number (hehehe). You can probably find another IMEI on the internet, too, but either way you need that. When you call in to AT&T customer support, just tell the rep that you've upgraded your device to a *insert name of device from which you got the IMEI* that you bought on eBay or something, and you want to make sure that you're on the correct plan. Provide them that IMEI, and now your account should be provisioned for HSPA+ (YAY! WOO!).

Now that that's out of the way, you need to configure your APN or APN's if you're using more than one (this only usually applies if you're grandfathered into an older plan). Go to Settings => Wireless and network => Mobile networks => Access Point Names. From here, tap the menu button and select "New APN."

Populate the fields as follows (Case sensitive!):

Name: Doesn't matter, you can call this whatever you want.

APN: Phone

Proxy: <not set>

Port: <not set>

Username: <not set>

Password: <not set>

Server: <not set>

MMSC: http://mmsc.mobile.att.net

MMSC Proxy: proxy.mobile.att.net

MMS port: 80

MCC: 310

MNC: 410

Authentication type: <none set>

APN type: internet + mms (if you're on a tiered plan) or just internet (if you're on a legacy grandfathered plan).

This APN info above is for achieving the highest possible speeds over HSPA+

The next APN generally offers slower data speeds, but depending on your area may not be any different in terms of speed after all. This is the old legacy Cingular APN, and you need to input these settings if you're on a grandfathered legacy plan, otherwise you may not be able to send/receive MMS properly.

Name: Doesn't matter, you can call this whatever you want.

APN: wap.cingular

Proxy: <not set>

Port: <not set>

Username: <not set>

Password: <not set>

Server: <not set>

MMSC: http://mmsc.cingular.com

MMSC Proxy: mmsc.cingular.com

MMS port: 80

MCC: 310

MNC: 410

Authentication type: <none set>

APN type: internet + mms

Congratulations! You should have now successfully set up both your account and your APN's properly for making your Note fully functional on AT&T! You should now at the very least be able to get onto the internet and browse etc. Pat yourself on the back! :)

But wait! There's more!

You still have to disable a feature on your Note called Fast Dormancy. Fortunately, this is really quick and easy to do. But first, what the hell is that, and why do I have to disable it? Well without getting all technical, simply put, it's a feature which allows a device to very quickly switch from an idle data state to UMTS/HSPA/HSPA+ and back to idle again, and generally work more efficiently, thus improving performance, and saving battery life. Problem is, in order for this feature to work, BOTH the device and the network that device is on need to support it. Unfortunately, AT&T does not currently support Fast Dormancy. As a result, by having fast dormancy enabled on your device, it'll have the complete opposite effect than what it was intended to have. Basically, your battery life will suck more, data connections will be erratic, slow, and unreliable, and you're basically wasting data overhead on a feature that, for AT&T, just doesn't exist. Disable it, and your Note will fly like it was intended.

To disable Fast Dormancy, from your dialer, enter in *#*#9900#*#*

This should pull up your SysDump menu. There, close to the bottom it should indicate your current Fast Dormancy state, enabled by default. Select that option, and it should indicate that Fast Dormancy is disabled. Exit and enjoy! Reboot the phone for good measure though. You generally don't have to, but sometimes it irons out any issues that may arise.

Hope this all helps! Enjoy your Note on AT&T!!

P.S. Hey Moderators!! Can we by any chance get this tutorial posted up as a sticky? Seems to be the best way to consolidate for AT&T users. Thanks! :)