I cannot sync my iphone 4 to my imac it connects for a few seconds then goes off

please can someone help me   When i connect my iphone 4 to my imac using bluetooth it pairs up but only lasts for a few seconds then goes off and shows
not connected  i have tried all sorts of ways  but  without success  why is this happening am i the only one  does anyone know the answer please

Seems like my problem - I have a new iPhone 4 and it does not want to pair with any device. It seems to connect, and is recognised by my MacBook pro, it shows the code that my Macbook shows, but then says it cannot connect. Neither did it connect to another imac, nor does it connect to my carphone. Have received a replacement (as I had bought the iPhone five days ago), have a new one now, but exactly the same problem. But I cannot alter the bluetooth settings on my iPhone, and restoring does nothing, nor leaving it in the completely unaltered setting, nor switching off all other wireless devices. Does anybody know how to solve this?
Arnold

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