Methods and systems are described for processing call blocking instructions and for managing mobile messaging. A method of processing call blocking instructions is described. A call processing system receives a call from a caller intended for a first user. A notification regarding the call is transmitted to a mobile device associated with the first user. A message from the user is received via the mobile device, wherein the message is a text or multimedia type message. At least partly in response to the message, the caller is placed on a blacklist indicating that future calls from the caller to the user are to be blocked.