Nokia 640 - Adjusting the Earpiece Volume; Last Number Redial

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call or make a new call during a call by first pressing , then
pressing Options and then selecting Service Codes. As the
Service Codes vary from country to country, for more information
about this, please, contact your service provider or network
operator.
The conference call service allows you to have a conversation with
several callers at the same time.
Adjusting the earpiece volume
You can adjust the earpiece volume of the
phone. Press the key to increase or
decrease the volume level.
Last number redial
The last five phone numbers you called or attempted to call are
stored in the phone’s memory. To redial one of these last-dialled
numbers:
1. With display clear, press once to
access the list of the last-dialled
numbers.
2. Use or to reach the desired
number.
3. Press Options to select a suitable function (
Call, Time of
Call, Edit number, Erase, Save
).