... carton,well package &EMS,DHL,UPS mobile phone screen protector,mobile screen protector,clear screen ... oil (fingerprint, facial oil, etc) left on the phone screen surface. Any of those will create air ... the adhesive side.Step 2: Clean the Screen with cloth.Step 3: Paste Screen Protector onto your phone ... screen, if not done properly, remove and stick again.Step 4: Press the screen ...