A mobile wireframe is basically a visual guide used in designing interface in correspondence to the display of the device. It is an illustration of the basic elements used in the interface and before making any visual design for mobile applications, creating a wireframe is necessary. Moobileframes is a collection of mobile wireframes found on the web.
Hannah Milan assembled this wireframe collection. She says that it is a collection of mobile wireframes scanned all throughout the web. On this tumblr blog, she has added posts with screenshots of the mobile wireframes and then the original link to the each of them. If you are looking for a collection of Mobile wireframes to design interface, have a look at this blog.