The present disclosure describes integrating SMS/MMS messaging with a collaboration platform, and filtering SMS/MMS messages within a collaboration platform. One embodiment includes associating a phone number with a project within a collaboration platform; receiving an SMS/MMS message at the phone number from a mobile telephone device; and based on receiving the SMS/MMS message at the phone number, adding the content of the message to an activity feed of the project. In another embodiment, a phone number can be associated with a plurality of projects. Attributes of SMS/MMS messages received at this phone number are compared to project data of the plurality of projects to route the message content to an activity feed of a project of the plurality of projects, or to a mailroom.