I've problem with Bluetooth on Nokia Lumia 520. Bluetooth on Samsung Galaxy Fit GT-S5670 work fine.
Bluetooth have found each other, but the Nokia Bluetooth is interrupted every few seconds.
Before, I made backup in .vcf file in Android. This .vcf file I copied and paste on SD Card in Nokia Lumia 520.
In menu on Nokia I go in Transferring my data, select import from SD Card, Run it and it is it.
i have found a solution using MS outlook .Using Samsung Kies PC Suite sync all contacts with MS outlook .the connect Nokia Phone and start Nokia PC suite and then again sync contacts with MS outlook all contacts will transfer from samsung to nokia