picture messaging

noun

the practice of sending and receiving photographs by mobile phone
the practice of communicating by mobile phone using graphics or pictures rather than text

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012