The company has a large number of international mobile phone numbers, but it cannot confirm which customers are using Viber. Direct operations will easily waste manpower and data resources.
The original number has no Viber registration status
Viber user coverage varies in different countries
Unregistered numbers reduce the actual use value of the list
Manually adding contacts one by one is very inefficient
Invalid numbers affect marketing performance statistics
Historical registration status may become invalid as the account changes.
