It isn't clear what you mean by "setting security".
Assuming you are looking for an AV, the App and Play stores have many AV apps, some of which are free. Comcast only offers free AV software for desktop and laptop computers. For mobile devices (phones and tablets) they have "Norton Mobile Security" for $20/yr. See http://constantguard.comcast.net/products-and-services/.
If you are asking about something else, what is it?