BGA function test

Our company laser re-ball's BGA down to 100 microns ball size. One of our OEM customers have asked us to function test there BGA on Mobile phone PCB's. Origionally we thought of a test sockets however the sockets interfere with other devices on the PCB. What I am looking for is a company that manufactures a Anisotropic conductive film so that I can test the BGA by powering up teh mobile phone while the BGA is pressed onto the ACF. Thanks in advance

Tony

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