Recent research conducted by TNS and sponsored by U.K. carrier Orange indicates that mobile users who adopt mobile instant messaging services subsequently reduce their use of SMS. Orange noted that older people still use text messaging even once they begin to use mobile IM. According to the report 38 out of every 100 messages (which include email, texts and picture messages) sent by users with no access to mobile IM are text messages. When those users gain access to mobile IM the figure drops to 23 text messages out of 100 messages.
For more on the study:
- read this article from Textually.org