What does two beeps mean on the LG Rumor?

Why does it beep loudly ( a double beep) as if the battery is low or something? I can't find any setting that will stop this! So annoying!?

It could be notification for signal fade or out of service. To turn it off:
1. Press Menu > Settings/Tools > Settings > Sounds > Alerts.
2. Select Beep Each Minute, Out of Service,Connect or Signal Fade/Call Drop and press OK.
3. Select On or Off and press OK.

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