Differentiated MMS billing based on roaming status determination of user devices

A first device may receive an indication that a multimedia message service (MMS message) message has been sent from a first user device to a second user device; obtain, from a second device, the roaming status of the first user device at a time that the MMS message was sent by the first user device; generate a call details record (CDR) indicating the obtained roaming status of the first user device at the time the MMS message was sent by the first user device; and store or output the CDR to a billing system that charges an account, associated with the first user device, for sent MMS message. An amount charged by the billing system may be based on the roaming status of the first user device at the time at which MMS message are sent by the first user device.