Information such as customer IP addresses, call logs, text messages and web surfing habits are all retained for a certain timeframe, and the length of time greatly differs from one carrier to another depending on the kind of data. Verizon loves keeping the list of people you’ve texted for a year, but T-Mobile can peer back into the crystal ball for 5 years, while AT&T has enough space for seven years.
While this might make Verizon appear seemingly look like having the most privacy-friendly policy, they are the only ones who actually retain what you’ve sent – for five days, while T-Mobile, AT&T, and Sprint don’t bother with what you’ve texted.
Interesting bit of information to digest, no?