Fast busy signal (plural fast busy signals)
What Does Fast Busy Signal Mean on Cell Phone eHow
Does the busy signal continue, or does it just beep about five or six times then give you a dial tone?
If the latter then you have unheard messages on the voicemail system provided by your telephone company. This system records messages when someone calls while you're already on the phone. Please contact your telephone company for instructions on accessing their voicemail system.
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