The Importance of Using a Preservation Letter
Many times in investigations, investigators will ask the providers for specialized reports such as PCMD, RTT, TrueCall, and NELOS. But sometimes the probable cause for a search warrant hasn’t been developed until weeks or months after the crime has been committed. By that time, some of these reports will no longer be available to you. These specialized reports have been key in solving crimes when the normal CDRs did not provide much value. That is why it is extremely important when a suspect phone number has been identified to send the preservation letter to their carrier as soon as possible.
Here are some examples of record retention schedules from the providers:
AT&T NELOS: 90 days
Sprint PCMD (LTE/EVDO): 10 – 14 days
Sprint PCMD (Voice): 90 days
T-Mobile TrueCall: 90 days
US Cellular RTT Data: 3 days
Verizon RTT Data: 8 days
Verizon SMS Content: 3 – 5 days
Here at CellHawk we make getting a preservation letter written simple! Visit our free resource Support@Hawk and search the phone number you are interested in. We will identify the carrier and then click on the preservation letter template. The language for the carriers to retain the data will automatically be generated and you will only have to input a start date and end date. In minutes you can have this generated for your case and save valuable data!