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• the primary PHONE NUMBER at your premise
• the exact list of phone related devices currently connected.
• whether you have a home alarm system, TDD, or wall mounted phones
• Whether you have caller ID or any premium telco services activated
• The address of the premise as it appears on your telco phone bill
• The name of the person or company as it appears on your telco phone bill
If any of this information is missing or incorrect, the order can be delayed or even cancelled.
Also read About DSL for lots more information