Yes shame it can't be included on the sim card "folder" as I recall it used to be. "3" have probably texted you with the number. Go into your router & look for the SMS Messages page; from there you can also send a free txt from the router to your/any phone. That'll show the number. I have a Huawei router & in my settings page, I navigate to this page. Where arrowed, the red blob indicates a waiting message.
