I've tested this to work on the Vodafone 360 H1 - but it should work with any JIL handset.
Because it isn't certified, you may need to dial
to remove the H1's security check.
The code is very simple. The JIL SDK allows you to call specific phone application - in this case, all I've done is invoked the browser.
One thing to note, if you're deploying the widgets from your website, ensure you have set the MIME type to "application/widget" - as per the W3C standards - otherwise many devices won't recognise it as a valid widget.
I work for Vodafone - this is my personal blog, I don't to speak for them. All opinions, claims and mistakes are my own.