Thank you for your feedback.
In order to benefit from Telerik support service I would kindly ask you to renew your license.
In the meantime you can still advice with our community using the forum channels.
As for your concerns, I guess you are talking about our Companion
app but it is not pretty clear what exactly the message is and which Cordova is required.
Indeed, the telephone links no longer launch the dialer but I cannot remember whether this has been working till now and we will investigate it.
I don't see a reason for the back button not to operate and I wasn't able to reproduce a crash when pressing it. The app just get closed so please provide more details about how we can reproduce the issue.