1. A method of implementing modem-assisted-service-classification (MASC) functionality for a subscription in a multi-Subscriber-Identity-Module (multi-SIM) computing device, comprising: receiving a signal from an operator network to activate MASC functionality for the subscription for an access point name; obtaining a policy file from the operator network for the access point name; determining whether an application has launched; determining whether the launched application is in the policy file of the access point name in response to determining that an application has launched; and sending a report to the operator network in response to determining that the launched application is in the policy file of the access point name.