Currently, as we are sending SMS, and inside `onMessageSending` there is a change in the hash, if this change happens it goes directly to https://github.com/borjasalguero/gaia/blob/c40a5c7a53919c3dadb74b62fedb0e9d1ebba008/apps/sms/js/sms.js#L135, and there we have `MessageManager.currentNum = num;` and inside `renderMessages`, we have `this.updateHeaderData();` as well.