Left image: Phone cleaner app for cleaning phone memory, with a 4+ star rating.
Right image: A pop-up message on a mobile device, showing that it is unable to install an app named "Phone cleaner" that due to insufficient availability of memory on the device.
The image is ironical, as to clear the phone's memory using phone cleaner app, one has to install it, but that is not possible in turn due to the phone memory being full.