There was a murder case in Ireland where the killer and the victim had had burner phones (they were in a secret relationship). Both Nokia, the old school ones.
The killer dumped them in a deep, very muddy pond that often froze over, had a ton of plants, fish, and algae, and the mud was very runny/could theoretically get into cracks easily.
Anyway those phones were down there ages. I can’t remember exactly how long, I’d guess a year or so. Police finally recovered them. They consulted data retrieval experts.
I kid you not, when they learned they were Nokias, they recommended just letting them dry out then trying to power them on.
Sure enough, those babies flashed right up. Like nothing had happened.