Acer S100 - Manual (Page 17)

17 Turning on for the first time
Turning on for the first time
To turn on your smartphone for the first time, press and hold
the power button until the system bootup screen appears.
Entering your PIN
When you install a SIM card for the first time, you may need to
enter a PIN using the onscreen number pad.
Important: Depending on your settings, you may be required to
enter your PIN each time you switch on the phone function.
If the PIN 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.