Have you checked the result of this ID? Currently it's a value which is not working as expected. `number` is a param retrieved from the `iconURL` due to we have a workaround there for making this work.
In your case you should add this `message.id` as well (check https://github.com/mozilla-b2g/gaia/blob/master/apps/sms/js/activity_handler.js#L153) and modify the code of `showThreadFromSystemMessage(options)` for using a param as: `options : { number: '123123132', body: 'Hola!', id: '1'} `. This will be useful in the future, when we use `thread_id` instead of `phoneNumber` for hash management within the app.
Please modify this and let me know when you will be ready!