1. UK hails 10th birthday of SMS, December 2002, The Times of India.
http://timesofindia.indiatimes.com/articleshow/30216466.cms
2. Americans sent 1 trillion sms text messages in 2008.
http://www.intomobile.com/2009/04/06/americans-sent-1-trillion-
3. GPP TS 03.40, Digital cellular telecommunications system (Phase 2+); Technical realization of the short message service (SMS) point-to-point (PP)
4. TEKELEC (2007) SMS security: malicious attacks are just around the corner. Are you protected?
5. Androulidakis I (2009) Security in SMS. IT security professional magazine, Issue 11, pp 36–41