Default how to transfer contacts from my lumia 520 to nokia asha 208

not being able to transfer my contacts from lumia 520 to asha 208. i used "transfer my data" app but it doesnt work.
i backup the .vcf file from windows phone but it is not working in nokia asha because it doesnt support .vcf it supports only .nbf files...

so is there any way to transfer contacts from my windows phone to nokia asha 208 ??