How long does internet history stay on record with the ISP?

I'm with sprint for my iPhone so I don't know if sprint has my record or if it's our internet company, but around how long do they keep your record? We're thinking of switching our phone plan but again I don't know if they're the ones that have our records or if it's our internet company. So around how often do they keep your record if you don't switch (like if I stay with the company how many years will they have my record?)

When you change phone providers, your entire contact list is lost if you don't take steps in advance to save it.

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