Do you use those clear screen protectors? I bought a different brand the last time. They were cheaper and yes you get what you pay for! I couldn't get all the bubbles smooth and the sides keep lifting!
I have an iPhone, and I bought these screen protectors. They're cheap and work great! I've had one screen protector on my phone for about 2 months now and no problems so far.
A trick for getting out the bubbles is to use a credit card to smooth the screen protector when putting it on. There are numerous YouTube videos that demonstrate it.
I went to the kiosk at the mall and bought one for $10. The guy working there put it on. You cannot tell there is a screen on it, and I did that last July!!!