Dreaming that your husband calls a woman may reflect your anxiety or uneasiness about your relationship with your partner in real life. The telephone number 6600 may be a specific symbol in this dream, and it has no specific factual basis to explain its meaning. So it is impossible to accurately judge the meaning of this dream.
Everyone's dream is unique, and the interpretation of dreams needs to be combined with personal life experiences, emotions and surrounding environment. If you are confused or uneasy about this dream, I suggest you think about all the elements in the dream, recall your recent experience and feelings, or consult a professional psychological counselor for more specific explanation and support.