I have installed Viber recently in my Android-based cell phone. After installation, Viber got access to the entire phone contacts. The contacts who have Viber connections are marked by the logo on the right side. But the contacts who have no Viber connections are also in Viber list and do not appear in the phone's contact list. So it became difficult to dial those numbers from my cell phone, making it necessary to note down the number first and then from the cell phone dial.
Without deleting or deactivating the Viber installation, how can I remove these contacts who are not using Viber?