Call customer service from your service provider.
AT&T Customer Service 1-800-288-2747
You can also try a soft reset on your phone with the phone ON remove the battery wait 5 seconds put the battery back in the phone and turn it back on. Or you can do a wipe/hard reset
Samsung GT-i9000 Galaxy S hard reset
1. Turn off the i9000 phone or take out the battery and reinsert it.
2. Hold the Volume Down button
3. Press and release the Power button
4. Select Clear Storage by pressing the Volume Down button
5. Press and release the Power button
6. Press Volume Up to confirm i9000 master reset
A network which contains many network components of both hardware and software can incur failures due to one (or even multiple) of its contained components incurs a failure. Ranging from the largest to the smallest and from hardware to software, network failures can be divided into the following categories:
Single failure and multiple failures: in general network failure implies a single network failure because network failure normally seldom occurs. However, under some situations, there can be more than failure occurring with a network. This kind of situation is called multiple failure, example, dual failures and triple failures. For a network, planning for full recovery of multiple failures generally requires much high protection capacity than that of purely for a single failure.
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