NOVELTY - The holder (210) has a lower shelf (6) that is attached to a base of a holding portion (212) to support a mobile device. An upper shelf (10) is affixed to portion (212) to slide along a plane defined by portion (212) toward lower shelf. A pivot assembly (214) is connected to portion (212) to pivot about a pivot axis (P) such that lower shelf is attached to base at a fixed distance from pivot assembly. A mount unit (218) is affixed to pivot assembly so that portion (212) and shelves are pivoted together about the axis relative to mount unit between upright and stowed positions.    USE - Holder for holding mobile device such as smart phone and mobile phone in shopping cart (claimed) such as grocery cart at retail locations such as supermarket and for attaching to mobile or stationary structure such as automobile, bicycle, and stationary exercise machine.Can also be used for holding tablet computer such as iPad (RTM: tablet computer designed and manufactured by Apple), smartphone such as Blackberry (RTM: wireless handheld devices and services designed and marketed by Blackberry Limited), iPhone (RTM: Smartphone designed and marketed by Apple Inc.), Android (RTM: mobile operating system based on the Linux kernel and currently developed by Google), personal digital assistant (PDA), global positioning satellite (GPS) device, portable music player such as iPod (RTM: portable media player designed and marketed by Apple Inc.), electronic reader (e-reader), palmtop computer, and pager.    ADVANTAGE - The upper shelf is pulled in a direction away from the lower shelf to extend the spring and create tension so that the extended upper shelf is released to allow the spring to pull the upper shelf toward the lower shelf in direction until the slide guide reaches its travel limit when the mobile device is not hold. Thus, the spring provides adequate tension to securely and removably hold mobile device of varying widths or heights at different viewing angles while limiting movement and shaking and while allowing a user/shopper to easily remove the device from the mobile device holder. The lower and upper shelves are provided with the pads?to contact the sides of the mobile device such that the pads are the soft coverings to avoid scratching of mobile device and are elastomeric to prevent displacement of the mobile device from the holder. Thus, the thickness of pads in depth directions of shelves is reduced effectively. Since the end gate, folding child seat, and secondary basket pivot together, the mobile device holder is mounted to the top of the secondary basket to provide nesting of the shopping carts while conserving floor space. Thus, the mobile device is close enough to the user/shopper for easy viewing and/or easy engagement with a mobile device touch screen while mounting the mobile device holder to shopping cart handle forces the user/shopper to look down at an uncomfortable angle and/or take eyes off the view ahead, and/or interfere with the nesting of shopping carts.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a shopping cart.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the mobile device holder with flip shelf in stowed position.    Lower shelf (6)    Upper shelf (10)    Holder (210)    Holding portion (212)    Pivot assembly (214)    Mount unit (218)    Pivot axis (Patients)