Depends on source of iPhone. If purchased from Apple or
authorized retailer, FaceTime will be unavailable. If purchased
frrom gray market source, FaceTime may be on the iPhone and
may work for a time. Updates to iOs or restoring iPhone may
wipe out FaceTime, and may cause other problems if iPhone had
been previously hacked/modified/jailbroken.
In what store/from which cellular provider did you purchase this
iPhone in Qatar? What does it say when you look at Settings=>General
Until veryrecently, Qatar was listed as one of the countries that banned facetime along with KSA and UAE. I see no, looking at the list, that Qatar no longer carries the note that facetime is not available.
It is possible that updating iOS may enable it now, but I have nothing to base that on other than supposition.