Why my pictures show blur when I save on my iPhone?

I have tow Nikon cameras. The pictures taken by Nikon Coolpix S8100 are perfectly fine and I can save and view on the photo album on my iPhone, but for some reasons, the pictures taken with Nikon Coolpix S3000 becomes completely blur when I transfer them on to my iphone to save them there. I actually used to be able to save pics from the Nikon S3000 but all the sudden this weird situation happeed. I even tried to downsize the photo size but no luck. And when I check the sizes, the both pics taken with S8100 and S3000 are similar range anyways. Please help! Thank you,

Added (1). Thanks for your reply!

But when you say "quality" is it a size of the photo, do you mean?

All I know is that the size of pic is 2.70 MB and I took exactly same pic later with my other Nikon S8000 and the size and details when I checked are same as the other. I'm still puzzled!

Added (2). I just found out that it seems that my iphone could be the problem. Because I just sent the same pic to my friend and he was able to save and view it crystal clear on his iPhone. So what this supposed to mean?

It depends on quality

It is a puzzle

The cameras are nearly identical but for the optical zoom and physical size of the cameras

Hopefully you are NOT trying to use the digital zoom on your camera.

Check the resultion as well as it could be simply because you are shrinking your photo to fit a iPhone.

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