I bought the 3-in-1 lens for an iPhone 4, and have to say that it was a disappointment. It doesn't make sense to me that the manufacturer would advertise this product with the iPhone 4, creating the illusion that it is compatible with iPhone 4, when it's not. In order to attach the lenses to the phone, you have to stick a magnetic ring to your phone, and this ring actually covers up the flash on the iPhone 4. This would be fine if it was a temporary magnetic ring that I could take off when I'm done with it, but it seems to be permanent. The one good thing I will say about it is that the lens quality seems quite good.
Very disappointed because I bought this as a gift for my husband and wanted him to be able to use it right away. We will be returning this product and trying out the ollocip:[...] A co-worker has the olloclip and she really likes it. I wanted to try this magnetic one first because it seemed easier to take on and off, and the olloclip is quite a bit more expensive, but the flash cover-up is a deal breaker for me. Olloclip also states on its site that it doesn't use magnets in its lenses because the magnet actually interferes with iPhone functionality. Well, if this is true, it's another reason to stay away from the 3-in-1 lens, I guess.
Another thing: the manufacturer of this product is a Chinese or Taiwanese company, so the instructions are really difficult to understand.