Problem
I am having problems pairing the headset with a mobile phone.
My mobile phone does not work when used within range of my Calisto headset.
My headset does not respond when I press the button.
Solution
Make sure that your mobile phone is Bluetooth enabled. If you previously paired your mobile phone with another headset, disconnect the link between the mobile phone and the headset before pairing the mobile phone with your Calisto headset.
During pairing, make sure that your Calisto headset is in pairing mode while your mobile phone is searching for Bluetooth devices. See the online pairing guide at www.plantronics.com/easytopair or your mobile phone user manual for more information. For complete pairing instructions, see “Pairing your Calisto headset with your mobile phone” on page 12.
When using the headset with your mobile phone for the first time, it is recommended that you do it out of range from the Calisto handset and base. Once you have successfully received and answered calls with your mobile phone, bring the headset back within range to answer both landline and mobile calls.
By default, incoming and outgoing mobile calls are automatically sent to the Calisto headset instead of the mobile handset when the headset is within range of the mobile phone. Therefore, if a call dialed or answered on the mobile phone cannot be heard, the audio is most likely in the Calisto headset. To transfer the audio back to the mobile phone, press and hold the Headset 
button for 2 seconds (see “Mobile call transfer” on page 15).
The Headset 
button should be pressed “inward” for under 1 second in order to answer or end a call. A high beep indicates that the headset has successfully registered the command. Pressing the Headset 
button longer could trigger a different headset command.
In some instances, there can be a slight delay between pressing the Headset 
button and connecting to a landline call (see “Placing calls” on page 9), connecting to a mobile call, or having the mobile phone perform a specific action such as redial or “call reject” (see “Additional mobile phone/headset features” on page 15).
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