Various methods and systems for collecting and analyzing mobile messages for malicious code are disclosed. In one embodiment, a method involves receiving a first message sent to a telephone number by a sender and determining whether the message contains malicious code. The first message is sent to the telephone number (e.g., a common short code), which is associated with a message analysis server, using a wireless messaging service such as EMS or MMS. The first message can be sent from a mobile communication device (e.g., by a user or by an application, such as an antivirus program, executing on the mobile communication device).