User's Manual Part 1

6 Preparing Your Phone For Use
7. The standby screen will be displayed, as well as network signal
strength and the name of the network operator. You can now use the
phone.
If the phone is not able to detect the designated network, or links to a
network that you are not authorized to use, the on-screen signal
strength meter will show no bars. You will only be able to make
emergency calls.