I've got myself in a pickle. The screen AND buttons on my Galaxy S3 have broken, so I've acquired a Nexus 6P phone. My old contacts and SMS messages are stored on the Galaxy S3 phone itself. I am able to plug the phone into the computer and navigate the file system, however USB debugging is not enabled. I can use Kies 3 to create backup files (.spb and .sme) but Kies 3 does not offer the option of converting to .vcf etc. Kies 2 can normally convert the files, however Kies 2 can't open the files created by Kies 3.
How can I successfully export the contacts and SMS messages from the Galaxy S3 onto the new Google Nexus 6P?