Joseph_S,
Thank you for your prompt replay. Unfortunately, your suggestions did not solve my problem.
If I try to sign in to FaceTime on my phone, I get a message that says, "An error occurred during activation. Try again."
Also, if I try to sign in to iMessage on my MacBook Air, I get a message that says, "Could not sign in to iMessage. An error occurred during activation." If I try to sign in to FaceTime on my MacBook Air, I get the same type of message.
If I try to sign in to iCloud with my MacBook Air, I get a message that says, "Network is unavailable or slow. There was a problem loading the application." However, I can sign in to iCloud on my iPhone through our home network. Home network seems to be fine.
I have the same problems and error messages on my iPad.
This is quite a mystery!
Cheers,
Hank