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After not having success with the CaseCrown screen guards, I found this one by Belkin at Target for about $12. It comes in a pack of 3 so is a great deal. These will work on both iPhone 4 and 4S. They are not sticky but instead stick with static and don`t come off! I had success applying this the first time I tried. All the air bubbles came out very easily! I have had it on my phone for over a month and it is on there just as good as the first day. I highly recommend these screen protectors by Belkin because they are a lot better than some others I have tried!