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Frosty - The VTech CM18445 is not capable of deactivating the 3 out of 4 lines capability. It will only give you a dial tone on the active line/s installed on the telephone base. For more details, please contact our Consumer Sales and Service Center between the hours of 9:00 AM and 3:00 PM Monday through Friday at 1-800-595-9511. Thank you, -VTech Support
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