I cannot see some of my contacts in the app. Why is that?
Your contacts need to be stored in your phonebook in the following format to be shown in the app:
+ 'Country Code' - 'Number'
For example: The country code for United States is +1 and a 10 digit US number is 8000100200. Thus a US number will be saved as: +1-8000100200
Note: You would also need to ensure that you're connected to the Internet for Ringo to import all your contacts.