How can I get caller ID turned on at my elderly parents home landline?

I am trying to troubleshoot a problem my sister had with her home phone regarding call forwarding. I understand there is a star code for call forward

There is a person, let's call him Ray - Ray has a home phone with ATT.  I know Ray, but I am not sure Ray has my best interests at heart.  Recently, p

what code turns off private mode on my landline phone with att?

I have my landline phone number set to block my info, yet allow me to dial *82 when I need to reveal it. I was thinking of doing away with this blocki

Hi. I have a landline where I have the Busy Call Forwarding feature. it requires that I need to call and have the number changed by a person. I can do

    Remote Call Forwarding is an easy way to turn on Call Forwarding when you’re away from home. With remote access, you can use any phone

I need to "remote" call forward an AT&T landline. I found partial instructions, but so far no one at AT&T can tell me if I can do it?

Are there any other models compatible with the EL51109? For example, the EL51209, which I have seen for sale recently.

We have a landline AT&T CL82114 cordless phone. Although we have blocked some phone numbers on the phone, some are still getting through. Is