Hi @vendimb15716755 ,
The Data will be pushed to the Marketing Instance to the schema called nms:eventHisto(Archived event), where you can able to fetch the mobile phone number field from it, The Data will be synced by these OOTB Technical Workflows named "Message Center execution instance 1", "Message Center execution instance 2" and so on. These OOTB Workflows depend on the number of execution Instances configured for your instance.

Regards,
Pravallika.