Hello all, I would like to know about best and free apps to detect any spyware into Samsung Galaxy S3 smartphone. I brought a Samsung Galaxy S3 from a local store before 3 months. It works perfectly but sometimes it received some unexpected msgs containing some special characters i.e questions sing, (&) sings and some digits (30, 15, 20). This is weird for me to having these type junk messages in my inbox. I googled about this problem but didn't find any solution. I hope you guys can help me in this matter. Thank You.