No, you can only set your Plivo numbers as a source number for messages towards US & Canada. This is due to
telecom regulations. You can, however, make an outbound voice call using Plivo APIs with non-Plivo caller ID.
Dynamic sender ids (i.e. non plivo numbers) may be used as a source number for messages towards international destination. However, it cannot be guaranteed that the source number displayed to the message recipient would match the number which was originally used. Reach out to us with your specific use case and the destination country to which to intend to send messages to learn more.