Using Brightkite in Japan

I'm using Brightkite in Japan. Brightkite is a mobile social networking service.
On this service, we can check in places and post notes. We also can post photos. In the US, users can do these actions by SMS, but here in Japan we can't do that. Instead of SMS, we can use email.
As I use Willcom's mobile phone, I can send email at no cost. So I check in a place, post a note, and post a photo by email.
If you want to check in the office (placemark you set), you send email like below:

To: personal code@bkite.com
Body:
@ office

If you want to check in a place, send email like below:

To: personal code@bkite.com
Body:
@ 秋葉原

By this you can check in Akihabara (秋葉原) Station.
If you want to post a note, send email like below:

To: personal code@bkite.com
Body:
! I'm having lunch at Lion.

If you want to post a photo, send email like below:

To: personal code@bkite.com
Attach: [photo file]
Subject: [caption for a photo]

Brightkite has a mobile version web site. If you don't like an email way, it is good for you.