I kid you not... last year around this same time, I was in Japan for vacation. I rented a SIM card from Softbank (one of the 3 only mobile carriers who still use SIM for some of their devices in Japan) and used it in my WinMo phone (HTC tytn II). Worked like a charm Unfortunately, it worked too well...

The only way one can use their own phone with a Japanese SIM card is that the phone has to be able to pick up a UMTS 2100 band... oh and it has to be unlocked of course. This means that you are using a data connection to place/receive calls, send texts/mmss or just about anything else. So thinking I was smart, I turned off anything that automatically connected to the internet (weather app, push email, RSS feed app, etc...). When I finished my trip and made my way back to the states, needless to say I was shocked to find an e-mailed phone bill from Softbank stating that I owed them ¥99,063(roughly $1000.00). Upon further investigation, I found out that there was a leak (perhaps an app I forgot to disable) and data rampantly ran free from my device the whole trip...

For WinMo this problem would have been solved by downloading a data tracker and this awesome app I found later after that trip. The app was called Nodata and it mainly functioned as an extremely easy on/off switch pertaining to data connections.

Now I have the N900 and I'm leaving for Japan in a couple weeks. I have a data tracker but now I'm looking for a data kill program such as the Nodata app I mentioned above. Any recommendations would be greatly appreciated

Thank you for your time,
John J