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i ordered bulk pack of brandless, and some areas once its applied do not want to stay down. there is nothing under like hair or dust but for whatever reason the adhesive layer seems to have random parts where its not strong enough.. thats pretty cheap tho so try it.
 
I've used no-names in the past and they always worked well. The plus side is they are super cheap so its not like you're out $20 if you damage your fancy one.
 
i just recieved 5 for the back of the phone for $3 :D The back fits perfectly but you get a air crease along where the aluminum meets the glass...but overall not that noticeable and it stays on flat even if you have a bumper case. The wet install ones always peel off at the edges.

BTW, i have SPG upfront.
 
I've tried these on multiple devices. These cheap s.protectors have quite a difference in quality as compared to those like SGP.

These cheap ones tend to
  • get scratched very very easily
  • often have rainbow/oil stuck on it
  • matte ones can really reduce your screen quality
  • quite thick (you will feel it when pressing the home button)
  • some aren't cut properly, causing sides to bubble up easily
 
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