Receptacle and plug connectors

A receptacle connector for a mobile telephone or the like comprises a housing of insulating material, a shielding, and a plurality of contact terminals. Channels extend parallel to the lateral sides between the front and backsides and the contact terminals are made as strip like elements mounted in these channels. At least some of the contact terminals each are provided with two retention parts having a width greater than the width of the channels providing a retention force mainly parallel to the upper and lower sides. The contact terminals each are provided with a butt-mount contact end and a tail end, wherein the retention part at the tail end has a width greater than the width at the butt-mount contact end. A plug connector for interconnecting a mobile device to a stationary device, comprises a housing of insulating material, a shielding, a plurality of contact terminals mounted in the housing, at least one latch element to latch the plug connector in a receptacle connector of the mobile device, and a button to operate the latch element. The housing of the plug connector is provided with at least one locating peg to be received in a chamber (′) of the receptacle connector.