Have you found any option yet? I use this mobile tracker www.hoverwatch.com/ . The most amazing feature of hoverwatch is that you can spy on the internet activity of the tracked device without being detected. It also provides access to a list of contacts, calendar entries and notes stored on the target, monitored device. Simply give it a try
If you suspect that your husband is committing a crime using his phone then would suggest speaking to your local police department.
IF you suspect that he is a cheater and you have access to his phone hit redial on the most frequent called numbers especailly at the times when you were suspicious of the converstation. If You dont have access to his phone He keeps it with him (sooner or later he must shower and sleep! if you share the same carrier you may be able to go on billing site and see what numbers are called. Hope this helps without you having to commit a crime
You can install this program on your husband's phone yourself. This program will run unnoticed for him. But you will know where your husband is, with whom and what he is communicating with, what files he is sending. You will know everything. Are you ready for this?