When I got my phone I got it for the mp3 player. What I didn't know is that they expected me to buy a $30 connector cable. I tried to be the smart consumer and just bought a Micro SD card with an adapter. I plugged that bad boy into my computer only to find out that it was write protected. I figured out the painfully obvious way to unlock it.
Step 1: Adapter
The adapter is the size of a normal SD. Plug the micro into the bottom.