Running the craptacular Samsung GT-B7722 running the sucky TouchUI.
Why? Because it was the "best" Dual Sim phone with the ability to have both sims active. If I'm talking using one sim, and someone calls the number on the other sim, the phone acts like I have call waiting. Many dual sim phones will kill the other sim when one is active giving a busy signal, or something similar.
It's useful when travelling overseas, allows me to make cheap calls without roaming charges while still being reachable in case of emergencies.
The camera on it is decent, but the whole UI tends to "freeze" often enough to be frustrating for a touch-screen phone. (I.E. The touch screen will stop reacting for a few minutes at a time.)
I don't suppose anyone else know a good dual sim phone?
My previous phone was an LG Vu (which allowed me to use a great sub-smartphone plan that allowed me to use an unlimited 3G plan). It still had it's kinks but didn't freeze like my new phone, but it didn't have the dual sim functionality.
I also have a first gen iPod Touch and a couple of Android Tablets (a Witstech A81G and a GTablet running a hacked rom). The iPod isn't jailbroken but the tablets are rooted and running Froyo (with some gingerbread elements). I'm looking keeping my eye on the alpha HoneyComb ports for the GTablet. In all cases, I use a MiFi (3G -> WiFi hotspot) to use the iPod Touch and Tablets on the go.