Anti-theft case for mobile phones

Anti theft case for mobile phones that has a flat design and can be attached to the mobile phone (20) to be protected and in a state adjusted for sensing an alarm the mobile phone (20) is in a wireless connection with an outer device or a mobile unit (40), wherein the connection depends on the distance from to mobile phone (20) and if the distance is higher than a predetermined value, the device or the mobile unit (40) is set to alarm state, wherein the case (10) has a side that covers a push button (25) located on a side of the mobile phone (20) to be protected and which controls at least the switching on and off of the mobile phone (20), and on this side of the case (10) a further push button (11) is arranged which is visible and can be handled from the outside and which takes the function of the previous push button (25), and the mobile phone (20) has a bottom comprising a multi-pole socket in which a connector (28) arranged in the case (10) is inserted which provides the function of the multi pole socket arranged in an opening made in the bottom of the case (10), and an anti theft application program is downloaded in the mobile phone (20) which in an alarmed state disables at least said switch off function of said further push button (11) accessible from the outside and sets the mobile phone (20) in a mode that realizes predetermined functions.