“When I press keys on the cordless handset, nothing happens.”
“When I press keys, digits appear on the display, but I can’t make a call”
“The phone does not ring”
“My call was cut off when I went out of range of the base unit. Now I can’t use my handset.”
“There is interference and noise on the line.”
Troubleshooting
Make sure the batteries are fitted in your handset. If the Battery Level symbol on the display shows ‘low’, recharge the batteries.
The keypad may be locked. Look for a 
on the display. If it’s there, unlock the keypad by pressing and holding
the #/LOCK 
button.
Try moving the handset closer to the base telephone.
Try a different position for the base telephone, making sure it’s not too near to any other electrical equipment.
Check that the base telephone’s mains power adapter is plugged in and power is switched on.
Make sure you’re using the telephone line cable that was supplied with your Big Button Combo. Other telephone line cables might not work.
Check that you have not set the ringer volume to Off.
Check that the total REN value of all equipment connected to your telephone line is no more than 4. Disconnect one or more telephones and see whether that helps.
Move the cordless handset closer to the base telephone before you try again to make a call.
Move the cordless handset closer to the base telephone, or to a different position.
Try moving the base telephone so that it’s not near other electrical equipment, such as a television or a computer.
Try a different position for the base telephone, making sure it’s not too near to any other electrical equipment.
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