Most people already appreciate that unlocked cell phones help you switch carriers more easily. You can buy unlocked cell phones cheaply online (no fees or contracts), and then you can switch carriers, if, say, they change policies and limit data to 2GB/month!
It turns out, carriers store different amounts of information about you for different periods of time. Verizon seems to be the worst offender, actually storing the content of text messages, and keep IP data the longest.
T-Mobile, AT&T and Sprint all keep data for differing lengths of time. If you’re concerned, make sure you have unlocked cell phones so that you can change to the best carrier for your needs/prefrences, and since unlocked cell phones = jailbroken cell phones usually, if there’s ever an app (like Tor for phones or something) that can help ensure privacy, it probably won’t be available in official app stores so best have unlocked cell phones!
What tips do you have for ensuring privacy when using cell phones? How do you adapt unlocked cell phones to enhance your privacy? Share your cell phone tips in the comments!