ocean10 Two screen protectors have worked for me
Standard Skinomi Screen Protector (sometime branded as "Clear HD "). If they do not make one for my specific device, I just buy one for the largest phone they make one for and then cut it down to size to cover the screen. This is my current solution and has rendered my phone 100% pain free. These seem to work the best on smartphones
Tech Armor Anti-Glare/Anti-Fingerprint Plastic Film Screen Protector. I have used these on an iPad and a Kindle Fire that were completely unusable and it rendered them 100% symptom free
These do not always work, I have had phones that the Skinomi cannot make useable (although most of the time it works) and iPads and Kindle Fire's that the Tech Armor does not help with (these are more hit or miss)
I got both on Amazon