Acer E101 - Manual (Page 15)

15 Turning on for the first time
Entering your PIN code
When you install a SIM card for the first time, you may need to
enter a PIN code using the onscreen number pad.
Important: Depending on your PIN settings, you may be asked to
enter the PIN each time you switch on the phone function.
If the PIN code you enter is incorrect, a warning message
appears.
Activating a new SIM card
If you are using your SIM card for the first time, it may require
activation. Contact your network operator for details on how
to do this.
The Today screen
Eaxch time you turn on your
smartphone, it will display the
Today screen. This screen gives you
quick, icon-based access to many of
the frequently-used features of your
smartphone.
The first time you start your
smartphone, you will see shortcuts
and function icons on the screen.
Some of them can be changed,
others not.