The feature that differentiates this from other Blackberries is UMA - unlicensed mobile access. In contrast to the AT&T Blackberry 8820, this T-mobile 8320 allows one to SPEAK over wifi. The 8820 can only use wifi for data.

First off, this is a great BlackBerry device that compares with any other BlackBerry device. Let's be honest: What you are interested in is how this phone works with VoIP over Wi-Fi. Okay, T-Mobile does offer the add-on "Hotspot@Home" service that allows unlimited calling when you choose to talk through the Wi-Fi network, but this is purely an option. This phone will still use Wi-Fi (or UMA), at the places you can access Wi-Fi, instead of using the T-Mobile cellular network... you'll just be using your plan minutes if you don't add on that unlimited option.

But, how does it actually work? Think of your home Wi-Fi router becoming another cellular tower. All cell phones "hand off" your call from one tower to the next as you drive down the highway. But with a UMA phone like this one, your home (or work) Wi-Fi becomes yet another available "tower" for your call to be handed to and from. So, start a call on Wi-Fi and walk out to the door, your call is automatically handed off to the T-Mobile tower without you noticing a thing. Started a call in your car on the way home? As soon as you walk in your front door, the call is automatically handed off to your Wi-Fi router seamlessly. As far as the phone and T-Mobile is concerned, it is no different than just driving further down the road to the next cellular tower. Yes, the phone easily connects even if your Wi-Fi requires a login (like most hotels) or the Wi-Fi signal requires WEP or WPA authentication.

I've been using my new phone for about one week and I've already burned through 250 minutes of my unlimited "Hotspot@Home" voice time through Wi-Fi, which before would have counted against my available plan minutes. You can't argue with the bottom line: this phone pays for itself almost overnight!

It is good at email, calendaring, messaging, web browsing and all those other office things, but as a phone? It SUCKS!

The phone quality is good, but the 'extras' that I've come to know so well after years of using Nokias and other phones just aren't there.

The bluetooth capabilities are very poor. It can only pair with a headset it seems.

I wouldn't recommend this for anyone who isn't in love with the idea of trying to send email from a phone.