Talkray is the same as any other application used to call and chat on mobile phones. Simply uninstall it and then delete everything about it from your mobile. Reboot the phone and access the Store and proceed to its reinstall. When started, you will be prompted to register again. This time you can use another number and that's it or access its settings and deactivate your account and then register again. It's the same process without the re-installing part.