“…They are severely annoying to users (Almeida et al, 2011;Wang et al, 2010). An example of an annoying spam text message is as follows (Yamakami, 2003;Gupta et al, 2019;Chen et al, 2018)"CONGRATS: YOUR MOBILE NO HAVE WON YOU £500,000 IN ---MOBILE DRAW UK, TO CLAIM PRIZE SEND BANK DETAIL, NAME, ADDRESS, MOBILE NO, SEX, AGE, TO -. Such messages come not only from domestic but also international senders. A survey revealed that 68% of mobile phone users are affected by SMS Spam, with teenagers being the worst affected community 1 .…”