I have pictures on my iPhone but the quality is bad, how do I improve it?

I have an iPhone 4 and someone sent me a picture but the quality is awful. Is there any way I can improve it?

No. You have to hold the camera steady

Try using Photoshop and resize the image to bigger resolution then save it.

Instagram it or use the sharp tool in photoshop.

Nothing you can do for the current photo, but for future photos You can improve it by telling that person who sent you the photo to shoot his/her photos in a more lighted area.
iPhone, iPad, iPod photos are terrible unless there's abundant light - and because people can't hold the camera steady

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