I don't know about you, but I've always wondered if those clip-on lenses for smartphone cameras were worth using. I've had a chance to try a couple out, and here's what I thought:
A modern smartphone has a camera that is more than adequate for most of the everyday snaps we take - and having the camera with you all the time more than outweighs any disadvantage from having a single, non-zoom lens. But there are occasions when you really would like to have a telephoto lens to get closer to the action, or to take a landscape shot, homing in on a particular detail. Although you can zoom digitally, this drastically reduces the resolution, often producing fuzzy pictures.
I suspect I won't carry it all the time, but I will have it with me on occasions I feel I might need to get that telephoto image - on walks, for instance, or on holiday - and I am sure that my photographs will be significantly better as a result. A 2x magnification may not seem vast, but for shots of scenery or wildlife it will seriously improve the final image.
The Havit HV-MPC04 is available from amazon.co.uk and amazon.com.
I also tried out a wide-angle lens from the same manufacturer (the Havit HV-MPC03), which is very similar in concept, but gives a wider view. The case and operation are identical and here's the side-by-side view with the basic camera shot on the left.
I think I'm likely to use this less than the telephoto, but it will sometimes come in for those shots - for instance of a building in a city - where you can't get far enough away from the subject.
The Havit HV-MPC03 is available from amazon.co.uk and amazon.com.