An over-voltage protection circuit for a mobile device comprising: at least one connector comprising at least two electrical contacts for connecting an external device and at least two internal contacts to a circuitry, wherein an electrically operated switch is connected between the at least two electrical contacts of said connector and said internal contacts, a control element for operating said switch, a first voltage determining unit configured to detect a voltage at a point between said at least two electrical contacts and said electrically operated switch, said first voltage determining unit being connected to said control element, and wherein said control element is configured to open or close said switch based at least in part on the voltage detected by said first voltage determining unit, wherein the over-voltage protection circuit further comprises a second voltage determining unit configured to detect a voltage at a point between said at least one internal contact and said electrically operated switch, said second voltage determining unit being connected to said control element, wherein said control element is configured to open or close said switch based at least in part on the voltage detected by said second voltage determining unit; at least one further electrically operated switch interconnected between at least one further electrical contact of said connector and at least one further internal contact to said circuitry, wherein said control element is respectively connected to each said at least one further electrically operated switch to control said switches, wherein said over-voltage protection circuit further comprises a further first voltage determining unit to respectively detect a voltage at a point between each said further electrical contact of said connector and said further electrically operated switch, wherein said over-voltage protection circuit further comprises a further second voltage determining unit to respectively detect a voltage at a point between each said further internal contact and said further electrically operated switch, wherein said further electrically operated switch is connected to said control element, wherein said control element is configured to open or close said switches based at least in part on the voltages detected by said further first and second voltage determining units; and a switch matrix interconnected between at least two of said electrical contacts of said connector and at least two of said internal contacts to said circuitry, to reallocate or rearrange the connections between these contacts of said connector and said internal contacts to said circuity. at least one connector comprising at least two electrical contacts for connecting an external device and at least two internal contacts to a circuitry, wherein an electrically operated switch is connected between the at least two electrical contacts of said connector and said internal contacts, a control element for operating said switch, a first voltage determining unit configured to detect a voltage at a point between said at least two electrical contacts and said electrically operated switch, said first voltage determining unit being connected to said control element, and wherein said control element is configured to open or close said switch based at least in part on the voltage detected by said first voltage determining unit, wherein the over-voltage protection circuit further comprises a second voltage determining unit configured to detect a voltage at a point between said at least one internal contact and said electrically operated switch, said second voltage determining unit being connected to said control element, wherein said control element is configured to open or close said switch based at least in part on the voltage detected by said second voltage determining unit; at least one further electrically operated switch interconnected between at least one further electrical contact of said connector and at least one further internal contact to said circuitry, wherein said control element is respectively connected to each said at least one further electrically operated switch to control said switches, wherein said over-voltage protection circuit further comprises a further first voltage determining unit to respectively detect a voltage at a point between each said further electrical contact of said connector and said further electrically operated switch, wherein said over-voltage protection circuit further comprises a further second voltage determining unit to respectively detect a voltage at a point between each said further internal contact and said further electrically operated switch, wherein said further electrically operated switch is connected to said control element, wherein said control element is configured to open or close said switches based at least in part on the voltages detected by said further first and second voltage determining units; and a switch matrix interconnected between at least two of said electrical contacts of said connector and at least two of said internal contacts to said circuitry, to reallocate or rearrange the connections between these contacts of said connector and said internal contacts to said circuity.