Nobody want to find themselves in the position where they no longer trust their girlfriend.
But people find themselves needing to obtain information for their peace of mind.
Many people want to know how to trace cell phone calls.
To trace cell phone calls you will need to get the number from you girlfriends' cell.
You can do this by looking at the call history on her cell.
Once you have the number you can get the name and address of the owner of the number.
Next you will need to go online and find a reverse cell phone lookup service.
These services will allow you to trace calls.
For $10 you can enter the number from your girlfriend's cell  and the service will give you a full report that will have included:

• Name of number owner
• Address
• Carrier
• Location information

These companies allow you to trace phone calls for unlisted numbers also, the services are an invaluable resource to anyone trying to find the owner of a cell number, they provide this service by maintaining a large database of numbers that they have collected through many different sources.
If you want to use the service more then once, you can buy a subscription which will allow you to trace phone calls multiple times.
The report is given in an easy to read format in just a few minutes.
Often people wish to trace  cell numbers; there are various reasons and needs for this.
Sometimes for peace of mind it can be who there girlfriend has been talking too.
A  service that will do a reverse search  will allow you to find the name, address and additional information of a cell number.