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 and START with KX-TG, but have NO "A" in it (that is for the cordless handsets).
2) How many TOTAL cordless handsets do you have with this system, and if more than one, do ALL handsets have this same issue?
3) What phone service provider (phone company) you have for this phone line?
4) If you have ANY other devices (phones, fax, etc.) with Caller ID displays attached to this same phone line and if so, are they working properly?
Please REPLY using the box below.