Screen protectors were once an absolute must for telephones because screens were about as sturdy as chilled butter. These days? Not particularly.
Complete openness: I was religious about placing a screen protector on my phone. It came to the point that I would buy the protector before I bought the phone, so as soon as the cling film came off the screen, I could pop up the protector.
But today? I haven't had a protector on my screen for a few years. The glass technology is so advanced that there is little to no chance that the screen protector you are buying is harder, more durable or has better anti-fingerprint technology than the super-strong Gorilla glass screen on your phone that is covered with much more advanced anti-fingerprint and anti -glare coatings.
If your phone is put safely in your pocket 90% of the day, what exactly do you protect it against?
There are of course exceptions to the rule. Although my iPhone spends the whole day in my pocket, away from anything that could harm it. My wife's iPhone spends the whole day in her bag, which looks more like a wood chipper filled with makeup compacts and keys than the soft, secure case that is my pocket. In that case, we are willing to use screen protectors as ritual sacrifices to protect the actual screen of her phone.
For more info on why you can probably discard your screen protector (and when there is a good idea), view our full treatment of the subject on Review Geek.