SOURCE: Expandable handsets lose activation:
USer manual requires,
full charge 16 hours for expandable handsets, then place in cradle ~20 seconds until 'ready' is displayed on the screen.
If power is lost the handset may have to be re-registered.
if the units are not fully charged when you register them the registration may be lost, can only suggest reversing the order, by fully charging the device then registering to see if the registration holds
SOURCE: I have a 3 phone
May be your base just doesn't support 3 phones at the same time. Try to turn off one of the working phones, reboot your base and reregister the one that you have problems with. If it works then turn on the turnedoff phone and try to register it, if the same problem appears with this one, then your base just doesn't support 3 phones at the same time.
SOURCE: I have a uniden 5.8 GHz Expandable Cordless phone.
http://www.uniden.com/products/productdetail.cfm?product=TRU8885-2&page=5
find your model and go to manuals on the home page. pdf file can be downloaded or you can search text from the file.
SOURCE: Need free downloadable manual for Uniden
You didn't mention a model number, however try this link: http://safemanuals.com/user-guide-instructions-owner-manual/UNIDEN/DCT7585-_E
SOURCE: My handset has a blinking icon, indicating not close to base
Press and hold the clear (mute) button for about 5 seconds until the phone beeps
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