This has been an on going issue with my photography.. I'm wanting some thing better. I've not tested any of these because I've found them to be clumsy while mounted over the devices external lens. Hanging the DPReview, they often review and talk about these types of addon and sadly I've not seen anything positive about them, except a slight glimmer of hope has come from the Sony Cyber-shot add on lens.. But again.. attaching this large center mounted lens onto your smart phone can be awkward.
In my opinion and just as soon as smart phone developers merger a better way to take images with your smart phone or device, I'll have to resort to caring a small pocket sized camera as a secondary means to taking pictures.
However and as a follow up.. I've seen this camera suggested to me via the DPReview site.. I think this should have been the direction the smart phone and camera should have taken.. Both camera and smart phone functions all in one.