AT&T Lands Phones - Page 9 - Recent Questions, Troubleshooting & Support

Try *79

This problem can be caused by the following, A bad battery, (which you say you are all new). A full base memory and a Faulty main base unit This main base unit can only expand to four handsets and no more. If the base unit has been reset then the assigned numbers for each handset would begin with " handset 1" if they show any other number when reset then it would not have been reset..To re-set main base you will have to De-Register All Handsets Unplug the power supply from the base unit then Remove all handsets from the charge cradles and base then Press and hold the PAGE button on the base. Plug in the power supply again while pressing the PAGE button, Continue pressing PAGE until the IN USE and CHARGING indicators are lit. (this could take up to 10 seconds) Release the PAGE button All Handsets will display "enter base id". If this does not solve your problem then you will have to replace the main base

There are different kinds of rechargeable batteries. NiCad and LI ion. There are also carbon batteries that can be recharged.