Prepaid Check Card

My friend thinks her husband is cheating (before he had a contract with a cell phone provider and she could not see who he called) has now prepaid cards can verify it calls somehow?

Yes, he has a prepaid phone? Go to the homepage of the provider husbands cell phone, you can connect everything you need to know is the number of cells and the password ... usually the last 4 digits, then just look at all transactions!

It's easy!
You can call the phone company prepaid and ask the CDR (Call Detail Records) for the card number, your husband is using.
The only thing needed is the number of prepaid card series.
These companies have all the call records in their exchanges, for each of the prepaid cards they sell.

You asked three questions about your friend and her husband can cheat ... good god, give him rest. This is not your problem. Stay out of it for your own good.