Ionic package build android disables all native functions

I have an app with about 20 emergency phone numbers (in buttons), a call to an email-address and one to a website. All work fine in ionic view and when packaged from ionic Creator. When I download the app from Creator an change just the “Back” to the German equivalent and center the page title (align-title=“center”), the app still works fine in ionic view but after packaging, installed on my Samsung J5, no native functions work. Win10, node 4.4.7, cordova 6.3.1, ionic 2.0.0.
Thanks for your help!
Fritz