I have a pro subscription in my Telefon but I want to fly in my iPad but it shuts down when I finish my flight plan
You may not use both devices at the same time. Make sure the app is closed on your phone before using it on the ipad.
If you want to transfer your subscription from android to ios, contact firstname.lastname@example.org
Just for clarification, a sub can be transferred from email to email. If your account is linked to an email, it can be used on different platforms (not at the same time, of course).