content: Congratulations, you made the job simpler. It's not the computer hardware of the device that you need to worry about. It's the baseband radio, which information can be gleaned from by way of a MITM (man-in-the-middle) device, like a Stingray, or other IMSI-Catcher. There are probably 0 security features on your phone at all. That makes audio retrieval a whole lot easier. It may not have a speech-to-text engine, but your raw audio is available instead. The fact that it's not likely WiFi capable is your only real advantage, which is a pretty small victory.