OK, I've recently realized that I tend to write long reviews, so here are the pertinent points: (full review to follow)Pros:Windows Mobile 5.0/Activesync/MS Office support/PDF/Windows Media(Mp3/video player)/etc.WiFi/BluetoothScreen resolution/brightnessFull keyboardTouchscreenBattery life (for a PDA/Smartphone)Mini SD card slot placementmini USB portQuad band (and easy to unlock)Cons:Windows Mobile 5.0/Activesync/etc/etcSlowish processorBulkKeyboard "slide" mechanism loosens over timeNo "voice commands" out of the boxOk, here goes the detailed version:I should state that I'm not a Cingular fan (forced over after ATTWS was bought out by them), but between the GSM providers (them and T-mo) in this country, it's IMHO the better choice. This isn't a Cingular review, however. It's a phone review (apparently, some of the other reviewers here have missed that point!), so... I originally got this phone (08/2006) because it was the only Cingular phone with WiFi built in. I haven't kept up with Cingular phones lately, so I don't know if that has since changed.Form:Weakest link of all. I am waiting for someone to make a Win Mobile 5.0, full keyboard, Bluetooth, WiFi, touchscreen PDA/phone that's approximately the form factor of a moto Q or similar (new blackjack?). Since it doesn't exist, I guess this is the next best thing.The phone is large. Period. While it's no "brick" or "bag" phone (from the days when we had 3 watt jobbies that weighed 8 pounds), it is by modern standards a bulky phone. It's almost an inch thick and weighs a lot (official specs 0.9" thick and 6.1 ounces). HOWEVER, the bulk does allow for a georgeous 3.5" touchscreen display that takes up the majority of the front of the phone.The keyboard. Love it and hate it. Size of the keyboard is (relatively) huge and because of the size, the designers had to hide it away using a sliding mechanism. The problem is that the sliding mechanism loosens itself after a few months of using the phone such that after a while, the phone slides open if you're holding it up to your ear on a call. Sucks. Solution: use bluetooth! Otherwise, the keyboard is functional and can function for touch typing as it has raised bumps over the home keys of "f" and "j". It includes its own set of soft buttons to actuate the menus and such and it also actually has its own "windows" key for accessing the start menu. The keyboard backlighting is a nice touch as well, but it seems to turn off too quickly.Love that the memory card (miniSD) slot is accessible from the outside (not hidden behind the battery like in some phones).Other gripes: the phone has a 2.5mm earphone/audio out jack instead of the more common 3.5mm jack. Standard headphones with a minijack will NOT work without an adaptor. The volume button (upper left side) is a slider (slide up for vol up, down for vol down), and I think would be better served with a multipurpose "jog" wheel with push it to click functionality. Would help with one handed operation.Function:As a PDA:Windows. What can I say. It's a love-hate relationship. Love that it's got the same familiarity as XP, and has (basically) the same functionality in a superportable package. You can do Word/Excel/Powerpoint/Outlook out of the box. You can read PDFs. There's Windows Media for Mp3s and videos (the phone comes with a pretty decent set of headphones with volume control and call answer/hangup control on the cord), there's mobile IE (no need for WAP based browsing), there's a file zipper (like pkzip, winzip, etc), there's email and SMS, there's a great contacts/calendar PDA type setup, and there is also a pretty straightforward, easy to use syncing program (Activesync). You can do Powerpoint presentations from the thing (either via Bluetooth, IRDA, or a SDIO adapter!); how cool would you look hooking up your PHONE to the LCD projector instead of a laptop? Bottom line, anyone already using a Windows Mobile device will feel right at home and anyone who has used a Windows PC (who hasn't?) will pick it up rather intuitively. WiFi is awesome. I can basically use IE just like a PC over WiFi. However, surfing the internet on this thing can be a real battery killer!HOWEVER, it's Windows. It's a memory hog. Programs don't end when you "quit" them, and even if you go into the system menu and "stop" them via the memory manager, there's still a significant amount of leak. Gotta reboot every now and again to get the memory back. Also, I've had some hangs. Didn't expect that out of a phone, but, hello... it's Windows. Oh well. Hoping that the next generation of Win Mobile gets even better. As I've heard, this version is leaps and bounds better than 2003. (This is my first Windows "CE" product). There is an easily accessible "reset" button that can be actuated by the stylus or a straightened paperclip just below the IR window. Also, the processor is not the fastest. You'll notice switching apps or anything somewhat processor intensive (video/music) will cause your other apps to slow down.As a phone:Signal strength is good. Not Nokia levels, but good. Maybe a bit better than Motorola levels. Sound quality as a phone is great; as a speakerphone it's excellent as speakerphones go (those tiny stereo speakers do remarkably well). Microphone picks up accurately, and there are no complaints of vocal quality on the other side of the line. Dialing is via touchscreen. Sucks for touchtyping, and since there's not a voice dial function (out of the box), it's your only option for calling anyone not programmed in as a contact with a voice tag. There ARE aftermarket software solutions for voice dialing (e.g. "DIAL 0-0-0-5-5-5-1-2-3-4 SEND"), but come on...depending on carrier subsidies, spending between $300 to $700 on a phone, I expect the functionality to be built in! By the way, I use my fingernail to dial to be more precise when pressing the "keys" on the touchscreen. That way, you don't have to pull out the stylet everytime you make a phone call.Contact search is a delight. You can just start pressing keys (as numbers or letters), and the phone will automatically bring up the contacts which match. Example: you can press 2-4-5 and the phone will bring up anyone whose number begins with "245" or all the entries for "BIL" (like "Bil"l, "Bil"ly, pay my "Bil"l, etc.) or some other combination like that (like "BI J" for "BI"ll "J"ones). Quite amazingBluetooth paring is easy and bluetooth works well with my headset. Above average range and clarity.Battery life is excellent. I usually go 4-5 days inbetween charges on moderate phone/bluetooth usage, light internet/WiFi usage. If I'm heavy on the internet, maybe recharge in 12-16 hours or so (adequate for a day's work). Anyway, recharging is simple. Just carry a USB to miniUSB cable with you. Plug into any PC or USB power adapter and you're set.All and all, it's a unified device, with it's inherent limitations. A jack-of-all-trades cannot be perfect at everything it does, but the 8125 does everything well and with only a few drawbacks. I would MUCH rather have this one device on my hip than a phone, a palm device, a MP3 player, and still have to carry around a laptop. 5/5 (if I could, 4.75/5). Can't wait to see what HTC(the manufacturer for Cingular) has around the corner.