Sony Ericsson P910i - Manual (Page 58)

58 Phone
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Not all networks provide charging 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.
ALS settings (subscription dependent)
Use Alternate Line Service to make calls on two lines with
separate phone numbers. Some of the phone settings are used on
a per line basis. In most cases, the settings displayed apply to the
selected line. This is then indicated in the dialog title bar. In
other cases, the lines correspond to separate settings or tabs in
the dialogs.
To set the line tags
1. Select the ALS settings dialog.
2. Edit the names for line 1 and 2.
3. Tap
Done .