Originally Posted by scott_
I would also suggest the export/import option. That would probably be the easiest.
In addition to Scott's reply.
Export the contacts to your SD card. Save them to computer. Open gmail using desktop, switch from gmail to contacts:
and under the MODE setting, you will find import option:
In the future, upon saving new contact, select Google from the top menu bar. So they will sync automatically, as soon as you log in your next/new device with Google credentials.