Press ANS ON/OFF . The reality: If the mailbox is full, some CS2051 units will refuse to turn off until you delete old messages. Press MENU/SELECT → "ANS. SYSTEM" → "MAILBOX" → "DELETE ALL OLD". Then turn the system off.
: Inserting the rechargeable AAA batteries into each handset, ensuring correct polarity. vtech cs2051 manual
If you plan to sell the phone or if the menu is hopelessly glitched, a factory reset is your last resort. According to the : Press ANS ON/OFF
: Like many product manuals, the physical copy can be quite small, making the text difficult to read for some users. vtech cs2051 manual
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