The indispensable tool for a cheating spouse is a cell phone to stay in touch with their secret lover.

The important thing for you when you are suspicious is to zero in on the obvious as well as subtle clues while not allowing your spouse to know you are on to him/her. The way an unfaithful spouse changes the way they use their phone often provides big and sometimes conclusive proof of an affair.

The following are some of the changes in his/her phone use you can expect to observe if you are dealing with an unfaithful spouse.

The new addition - Sometimes a cheater, in an attempt to keep the communication channel with their lover isolated will purchase a new cell phone. Of course they will provide you with some clumsy excuse of the reason behind the new addition to be work or business related. If you are unaware of such changes, this should provide a strong clue of possible infidelity.

Increased security - If you notice your spouse has suddenly changed the security settings on their phone, by placing a pin code, preventing anyone from seeing the call history; you would be right to be alerted of something fishy. By trying to protect the details of their secret calls he/she ends up achieving the opposite.

If you have noticed this sudden change, you should have alarm bells ringing as this is the typical behavior of someone who is cheating. The fact is that by attempting to keep the call history hidden from you, they have just ended up alerting you to the fact that there is actually something to hide.

There is no real reason, other than to hide something, that your average spouse is going to add a security layer to their cell.

Shifty talk - Have you ever walked in to a room when your spouse was on the phone and immediately sensed a change in their tone? They become fidgeting around, speaking abruptly in a yes, no, manner and tense up. These are all strong clues to him/her being uncomfortable carrying on their conversation.

Past calls - Ideally when your spouse is out or in the shower, have a quick look at the history of the past calls on the cell, taking every precaution not to get caught of course. If you see any unknown or unusual numbers make a note of them. You can then check out the person behind those numbers by using reverse phone searches online.

But let me remind you that you should never call up or harass anyone or question them in any way. An affair is a problem between your unfaithful spouse and you, and it is not up to you bring in the other person.

Tim Denio has helped over 27000 men and women learn to discover the truth about infidelity in their relationship. To end your suspicions, and find out if you have a cheating spouse using proven shortcuts, visit : http://www.cheatingspousecaught.com