Reverse Image Search On Smartphone
Reverse image search on the Internet through Google is sometimes an irreplaceable thing; however, due to some unknown reasons Google has switched this function off on mobile devices.
Mobile version of Chrome provides you with an opportunity to highlight any image on a page and find it using Google image search, however, by default you cannot upload your own image to Google search from mobile devices (and vice versa, you can do it using the desktop version).
You can circumvent this restriction by choosing the Request Desktop Site option in Chrome menu, or using a more convenient web application at ctrlq.org/google/images/.
By opening this link on a mobile device in any browser you can upload an image using the picker dialog and conduct the reverse search of this image in Google. This website should be working in any browser on any platform, since it is using the standard API HTML5.