Wikipedia
GeoSMS
GeoSMS is a specification for geotagging SMS messages. It works by embedding locations in the message text, where the locations are formatted as 'geo' URIs as defined in RFC 5870.
It was developed in 2010 by Matthew Kwan, a PhD Candidate at the RMIT School of Mathematical and Geospatial Sciences and should not be confused with the Open GeoSMS standard.