Left no message, callerID says xxxxxxxxxxxxx CA

received two calls within minutes. the caller i d is all x's yet nobody answers when you say hello. If you try to call it back the message says your call cannot be completed right now please try again later.

Received calls within minutes of one another.  No one responds when you answer the call.

Same as above. No one there. Repeated phone calls, Unavailable number.

Received two consecutive calls. First was blocked. I will now block this one as well. ID is Out Of Area. Prefix is San Jose, CA