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Caller id works on its own. Although you need double a batteries to power up the display. Also note that the display doesn't have a back lit and it may seem dark looking from certain angles.
Sorry, there was a problem. Please try again later.Whoever provides your 'landline' phone service has to provide a "caller ID" option. Then we you connect or use a 'caller ID capable phone, this feature will automatically work. So, the caller ID feature of your phone will not work unless your phone service has this option.
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