I changed over to XT from Vodafone, and I haven't changed my habits but I seem to be burning through my 120MB allowance and I can't understand what's going on.
At home I'm connected to wi-fi, so on Saturday 16th Jan I left my iPhone 3GS at home the whole time so it was always connected to my network, yet somehow even that chewed through 4.1MB.
Here's a sample of my usage taken from YourTelecom:





IP Packet00:21:0011/01/2010 2:41pm$0.00

IP Packet00:21:0011/01/2010 3:37pm$0.00

IP Packet00:21:0011/01/2010 4:37pm$0.00

IP Packet00:23:0011/01/2010 5:37pm$0.00

IP Packet00:22:0011/01/2010 6:42pm$0.00

IP Packet00:22:0011/01/2010 7:37pm$0.00

IP Packet00:24:0011/01/2010 8:37pm$0.00

IP Packet00:22:0011/01/2010 9:39pm$0.00

IP Packet00:21:0011/01/2010 10:37pm$0.00

IP Packet00:22:0011/01/2010 11:38pm$0.00

IP Packet00:22:0012/01/2010 0:38am$0.00

IP Packet00:25:0012/01/2010 1:37am$0.00

IP Packet00:21:0012/01/2010 2:38am$0.00

IP Packet00:22:0012/01/2010 3:38am$0.00

IP Packet00:22:0012/01/2010 4:40am$0.00

IP Packet00:21:0012/01/2010 5:39am$0.00

IP Packet00:03:0012/01/2010 6:37am$0.00

IP Packet00:14:0012/01/2010 6:43am$0.00

IP Packet00:26:0012/01/2010 7:24am$0.00

IP Packet00:23:0012/01/2010 8:21am$0.00

IP Packet00:25:0012/01/2010 9:25am$0.00

So you can see that just about every hour there is some sort of data usage. During the day I'm at work connected to the network,
after about 3.30pm and until about 6.30am I'm at home connected to my wireless network.

I never went through it this quickly on Vodafone, so can anyone shed some light on why this is happening, what those times mean
above, and how I can still manage to use 4.1MB on the network despite being connected to my wi-fi network?!