Headset/ Charger / USB Cable connector

Volume key

• When the screen is idle: Controls the volume of Ring tone.

• During a call: Controls the volume of the earpiece.

When playing a BGM track: Controls the

volume of music.

microSD/memory/ card slot

Installing a memory card

Lift the memory card cover and insert a micro SD card with the golden contact area facing downwards. Close the memory card cover so that it clicks shut.

To remove the memory card, gently push it as shown in the diagram.

Note: A memory card is an optional accessory.

Formatting the memory card

Press and select Settings. Choose

Memory Manager select External memory and press Format.

WARNING: When you format your memory card, all the content will be wiped. If you do not want to lose the data on your memory card, back it up first.

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Mitel GB255G manual Installing a memory card, Formatting the memory card, Volume key, Volume of music