No Network; System Failure - Sony Ericsson P800 User Manual

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No network

This indicates that no network is within range. The reason for
this is either:
1. You are in an area that is not covered by a network.
2. The received signal is too weak, possibly because you are
being shielded from the signal. Move to obtain a sufficiently
strong signal. Check your display signal strength indicator.

System failure

In case of a system failure, your P800 will flash an animated
warning. To recover, please restart the P800 like this:
1. Press and hold the On/Off button at least 10 seconds to turn
the P800 off.
2. Restart as normal: Press the On/Off button to turn on your
P800.
Troubleshooting 181