Transferring Contacts via Google Sync:

You can easily transfer the contacts stored on the HTC Desire 600 to the Sony Xperia T3 by syncing the contacts with a Google account. This is a very common method of transfer and doesn't require a computer to complete it

  1. On the HTC Desire 600, sign in with your Google account
  2. From the home screen, swipe the "Status" bar with two fingers
  3. Tap "Settings" and swipe to "Personal"
  4. Tap "Accounts & sync" and tap "Google"
  5. Select an account and clear > mark the "Contacts" check box. Alternatively, tap "Menu" > "Sync all"
  6. On the Sony Xperia T3, open the "Settings" menu
  7. Tap "Accounts" and register the same Google account as the one used on the HTC Desire 600
  8. Allow the account to sync contacts with your device and you're all set

Transferring Contacts via "Import / Export":

Using the contacts / people app you can export the contacts stored on the HTC Desire 600 in the form of a VCF file, which can then be transferred and imported to the Xperia T3 via email or through a computer.

  1. Open the "People" application on the HTC Desire 600
  2. From the "People" tab, tap "Menu"
  3. Tap "Manage contacts" > "Import / Export contacts"
  4. Tap "Export to phone storage"
  5. Choose an account and ensure that you remember the file's name before pressing "OK"
  6. Launch the email client and compose an email
  7. Attach the vCard file to the email and send the mail to your own Gmail address
  8. On the Sony Xperia T3, open the email
  9. Download the attached vCard file
  10. Launch the "Phone" app and go to the "Contacts" tab
  11. Tap "Menu" > "Import contacts"
  12. Choose to import the contacts from the storage / SD card
  13. Select an account if necessary, and then load the vCard file and tap "OK"

NOTE: After you have created the vCard file on the HTC Desire 600, you can transfer it to the Sony Xperia T3 using a computer. You can connect both smartphones to a PC via USB, and then manually transfer the vCard file from the Desire 600 to the "sdcard" directory on the Xperia T3. Then, you can import the file's contents via the contacts app and the "Import" function

Using "Send Anywhere" to Transfer Contacts:

Last but not least, you can use third party applications such as "Send Anywhere" in order to transfer various types of files including contacts, from the Desire 600 to the Xperia T3. This app makes use of a P2P connection

  1. Visit the Google Play Store and install "Send Anywhere" on both Android devices
  2. After the app has been installed, launch it on both smartphones
  3. On the HTC Desire 600, tap "Send" > "Contacts"
  4. Select the contacts that you wish to share, and then tap "Send"
  5. Finally, determine the method of contact transfer. By tapping "Generate QR Code" on the Desire 600, you can create a code which can be scanned for the Sony Xperia T3's camera in order to commence the transfer. Alternatively, tap "Receive" on the Xperia T3, and enter the randomly generated code to start the file transfer

See More: Transfer Contacts from a HTC Desire 600 to the Sony Xperia T3