AT&T CLP99283 - No Line Alert; Cell Alert

Telephone settings
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Handset and telephone base settings
No line alert
If there is no telephone line connected to the telephone base, the screens
show No home line. If you do not want to display this message on the
screens (for example, if you use the cell line only), you can turn the no line
alert off using the code described below.
To turn off the no line alert:
Press MENU on the handset or telephone base in idle mode, then enter
662#. You hear a confirmation tone.
To turn the no line alert back on:
Press MENU on the handset or telephone base in idle mode, then enter
661#. You hear a confirmation tone.
Cell alert
If you have downloaded the Connect to Cell application and use the Alerts
manager (page 18), there are message notifications sent to your telephone
system. Your telephone system beeps once when your Android cell phone
receives text messages, e-mails or social media updates. You can turn the
alert tone on or off using the code described below.
To turn the alert tone off:
Press MENU on the handset or telephone base, then enter 252#. You hear
a confirmation tone.
To turn the alert tone back on:
Press MENU on the handset or telephone base, then enter 251#. You hear
a confirmation tone.