Chapter 8 - Voice Calls

Any time you make a call from your phone, your carrier (ATT, Verizon, T-Mobile, etc) logs it for billing purposes. If law enforcement were to obtain a warrant, it could get a record of all calls to and from your phone. There are ways to deal with this, but each method creates more problems. For example, if you used Google Voice to make a phone call, your carrier would not have a record of the call. However, Google would - it simply moves the record from one place to another. 

For now, your best option is to not make any calls you do not wish to have traced to you from your phone. Consider making the call from a friend's phone, work phone, pay phone - any phone that cannot be linked to you.