You can export all of the contacts on your phone to your microSD card, as vCard files. You can then copy this file to a computer or another device that is compatible with this format, such as an address book application.
Open the Contacts application.
Tap Export to SD card.
Tap the contacts you want to export to the microSD card. To export all of the contacts, tap the Select all checkbox in the top left corner of the screen.
Then tap Export and OK.