Is iphone 4S screen resistant scratch?

I've owned my 4s for 6 months from now and first day i got it, i asked the staff to put me a screen protector on it, so they did, but with time it starts to remove and its really annoying and bothers me when i use the phone, so i end up removing it all, i'm not thinking to buy another protector cuz i read that its resistant scratch, so please iphone 4S users help me, IS IT SCRATCH RESISTANT OR SHALL I JUST GET A PROTECTOR?
Pc:
If i wanna get a high quality screen protector i kinda get it from a really far far away place like it took me one hour and half to get there! And its quiet expensive its 15 pounds per one.

There's no such thing as a scratch resistant cell phone screen.

Most glass will resist some scratching (mild scratching, anyway), but in the end, the screen will get worn out from constant rubbing. They're made of glass, it's that simple.

One all smartphones I've ever had, I have used the simple slap-on screen protectors that come 10 or 12 in a package. They look kind of goofy, but they work, and my screens are always perfect. Sometimes you have to compromise.