Having no signal is read as isolation and the frustration of not getting through. Dream books link it to a message you cannot send, or to a need for quiet you have not admitted.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.