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microUSB is used for multiple things
You can use the microUSB port to charge the phone, connect to a PC, and connect to an external display with a MHL adaptor.
T-Mobile and Galaxy S III logos
There are a couple of logos on the back for the carrier and branding of the smartphone.
Left side of the Galaxy S III
Minimal buttons and ports are found on the Galaxy S III. The left side simply has a volume button. The right side just has the Samsung on/off button. The top is where the 3.5mm headset jack is found.