This has been bugging me a while.

When I write an SMS message using the built-in Messages app, it limits the message to 180 characters. That's fine, that's the limit of SMS as far as I know.

But, if I click on the little X/180 thing in the top right, I get a window telling me that I am on segment 1 of 1, etc.

Is it possible to send a multi-segment message? How do I do it?