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Subscriber Information: Verizon, 3-5 years. AT&T, depends on service length. T-Mobile, 5 years. Sprint, forever.
Call details (who, when you called) – Verizon, 1 year. AT&T, 5 years for prepaid 7 years for post-paid. T-Mobile, 2 years prepaid 5 years post-paid. Sprint, 18-24 months.
Text Message detail (who, when): Verizon, 1 year. AT&T, 5-7 years. T-Mobile, 2-5 years. Sprint, 18-24 months.
Text message content: Verizon is the only one who keeps this information, and they do it for 3-5 days.
IP session information: Verizon, 1 year. AT&T, only on non-public IPs for 72 hours. T-Mobile, not retained. Sprint, 60 days.
I guess each one has it's pros and cons. I was surprised to see that Verizon stands alone in saving text message content.