Sony Ericsson StreamMan P800 User Manual page 58

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Please refer to the onboard help for detailed information about
the Call meter settings.
Note PIN2 is required from your network operator for storing
any changes you make to the Call meter settings.
Not all networks provide charge information to the phone during
a call. If your network provides this service and your
subscription is for Advice of Charge Charging, you cannot make
or receive any chargeable calls if you are roaming in a network
that does not provide charging information. This restriction does
not apply when your subscription is for Advice of Charge
Information. You cannot change the type of subscription from
your phone settings. Please consult your operator for more
details.
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