Please ensure you are assigning your magicJack device phone number in the companion magicApp. If your magicJack device is expired, you. FREE Calls to U.S. and Canadian phone numbers – or to any magicJack number, anywhere in the world. magicJack APP will NEVER use your. Don't pay for a separate phone or service. Just download magicApp to your existing mobile. You can even add a new business number! In your retail office.