The Samsung S3 has an 8MP camera which I find does the job in most cases but as always the digital 4x zoom is useless.

Picked up this 12x zoom lens from ebay for £27. Comes with a phone backing case that the lens screws into and a tripod stand.

Does the job as you can see above in the before and after photos.

It only does 12x zoom, it does not zoom in and out. But you can grab different lenses like wide angle and fish eye. Have not looked for any other zoom lens because it would be pointless having loads and changing them all the time (for me anyway).

For not a massive price and seems to be good quality I deem this a WIN.