How to set up uniden phone to base

One thing to try is deregestering your phone and registering it with the base again.

Hole the # and 'End' key on the handset until the next menu appears (about 5 seconds). Select deregister phone (use the 'Menu' button). Do it again, but select "base unavailable". After that, set them in the base (not the handset charger) and they should register with the base.

This works on most Uniden model phones.

You cannot have both system working on same telephone line.

What model Uniden cordless phone?

problem solved threw uniden in trash and bought another brand

try connecting both phones via the base that is working and see if they recognize each other. Let me know if that works.

Reset Procedure for Cordless Phones
Question:
What is the general reset procedure for cordless phones?

Answer:
1. Disconnect Battery from handset(s)
2. Disconnect Phone Cord from wall jack
3. Disconnect Phone cord from base unit
4. Disconnect AC adapter from wall outlet
5. Allow to sit for 30 min
6. Reconnect Phone Cord to base
7. Reconnect Phone cord to wall jack
8. Reconnect AC Adapter to wall outlet
9. Reconnect Battery to hanset until you click or feel the plug snap into place
10. Re-Register Handset by placing on main base in most instances

Try a new battery. That is usually what "88" means.

No ,you cannot add any Uniden cordless phone. It has to correspond to the base phone .

if battery just replace battery but the head sets are compatible with other handsets of same ghz say 2.4 you just gotta set in base and let base recognize new hand set these phones are practically built the same way but only with new technology

You need to reset the main base unit. Unplug the power from the back of the base. While the power is disconnected, press and hold the delete key while reconnecting the power. Wait for a long beep tone. When the display shows 88 or P, press play button one time. If you have a phone without an answering machine, disconnect the power from the back of the base, press and hold find hs button while reconnecting power.