MicroSD cards allow a cell phone to store more media, as well as transfer files from the phone to the computer and from the computer to the phone. Your myTouch 3G phone is capable of housing a microSD card, which will give you gigabytes more room on the phone for files. Before you start using the card, however, you should format it to make it fully compatible with the phone. You will not have issues viewing or opening the compatible files as long as it is formatted to the phone.
Instructions
1. Remove the back cover from the phone by pressing the top of the cover, and pushing and sliding it down.
2. Insert the microSD card into the slot at the bottom, right of the phone. Insert it with the metal pins facing down.
3. Press the "Home" button and select "Menu."
4. Open the "Settings" option and select "SD card & phone storage."
5. Tap "Unmount SD card" and then "Format SD card."
6. Touch "Format SD card" again to format the card.
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