If a customer's spouse asks about the activities of the customer, will you provide the information?

Not unless she can provide a valid power of attorney that includes the activities of the customer. 

Thanks for the invitation. Every company has a rule regarding giving out information of their customers or clients. They treat them as confidential and should not be disclosed to anyone. So I personally would not give any information about our clients.

No, I wont.

he/She can take directly from his/her wife/husband

If a customer authorized the company to disclose to his relatives - than yes. Otherwise no.

It's quite obvious.

i personally answer this 

we are not share the  secreccy of the customer with the other custmer coz your relation is stand on trust if your trust break all the customers power and interest break.

According to business, sometimes the word of mouth is the best marketing tool. 

it is unethical to share customer information with anyone unless the customer is in agreement.

Sure, NO

unless she is not authorized, you can't gie any piece of information.

Having been working as a customer service agent forever now, I would say it totally depends on the policy set by the company and the rules set by the account holder. If that suggest yes than we have to, If that suggest no, then we cant ..... as simple as that.