Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) The FULL Model Number of the phone system you are working with? If this is a cordless system, that model should be printed on a sticker on the bottom or back of the MAIN base, or on the outside of the package - if you still have it.
2) CONFIRM the phone service provider (phone company) you have for this phone line?
3) If you have ANY other "Caller ID" phones (NOT part of the main system) attached to this same phone line and if so, are they working properly (display the Caller ID)?
4) How many rings are happening before the incoming call appears on the display?
Please REPLY using the box below and the SEND button.