Was wondering if anyone here was using an unlocked 8320 on a network other than T-Mobile?

If so, are you able to access your daily data usage through your carriers website?

If yes to both of these conditions, can you please do a little test fo me? Go to Manage Connections and turn on your Wi-fi and Mobile network (EDGE)

Then use a third party application (Opera Mini, Jivetalk, GMail app)

Check your daily data usage, you should be able to figure out if the third party applications are TRULY using wi-fi or just EDGE data.