I've just activated my new Lebara SIM. I want to buy a SIM for my wife and have both SIM plan's shown on my account in the Lebara app. How do I go about this? Do I need to purchase a SIM from the Lebara website in her name and her card details and then add that number to my account using the "Attach new SIM" button in the Lebara app, or is there another way? Does she need to create her own desktop account first on the website or app and then I can add her SIM (with her phone number) to my account or is there another way?