Which transfer methods does the Transfer my Data application support?

Transfer my Data supports transfer over Bluetooth and, starting from version 4.x, transferring contacts with an SD card if the contacts were saved on the card in a compatible format and your phone has an SD card slot. You can both import and export contacts with the SD card.

Lumia with Windows Phone 8.1 with SD card support can now create an SMS backup via the latest version of the Transfer My Data App. The Backup file is in .vmsg format, which can be opened with a simple text editor and is human readable.