How do I undo imported contacts? It started when I wanted to backup my Mom's contacts online in my email. I took backup of her contacts in a .vcf  file and transferred it into my phone via Bluetooth. Later that day, I wanted to go to the Bluetooth folder but I couldn't find it. Neither can I find the .vcf file. 

I went to Bluetooth menu -> received files and clicked on the .vcf file (not a real file, just a link). To my further surprise (read 'frustration'; the file existed) all the contacts of my Mom got imported into my phone. Android didn't ask me to import them. 

Moreover, I have no idea where is  that file located.  I searched the storage (extsd &amp; SD0) and nothing came up.
FromNokia 3310:
                                Contacts => Option => Share Contacts => Mark => Back => Done => Blue Tooth sharing screen comes => More  => Select BlueTooth Device => conn.

In Android Phone
Go to contact => More (option in top right side) =>Settigs => Import Export Contacts => Import VCard files(VCF) from your device storage to contacts on your device