Phone help

[W212]

Telephony question: what do I need to add to this connector in the centre armrest of my 59 w212 to work with an iphone 4 or 5?
The plug looks like a UHI but the casing it's mounted on has two side buttons which when squeezed allow it to move up and down about 20mm.
There is a further button on the front and a recessed button as well

 

[grumpyoldgit]

Presume you mean 2009/2010MY '59' reg.

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