First of all, thank you for your interest in I'm OK! Currently there
is no official client for the iPhone. While one is in development,
there is no planned release date for it.
Luckily you may still use the I'm OK service, though. The
phone-specific applications, in the end, simply sends a text message
to our service's phone number. When you login to the I'm OK website,
it should display the number you can send the message to.
If you have any further questions, don't hesitate to ask!
Thanks,
-Ted