Probably, but the phone providers have the info. Maybe the meta data, but storing ALL speech on phones would big a huge undertaking.
“but storing ALL speech on phones would big a huge undertaking”
Not really.
Voice uses far fewer bits and bandwidth than data.
A modern VoIP conversation only takes 8kbs. A short email is about 100kbytes...and very short at that.
Voice is the EASY and CHEAP stuff.
“the phone providers have the info.”
Definitely the texts — at least going back a couple years. Probably longer, from info I’ve seen on true crime solving documentaries, some of which are “cold” cases and, therefore, older.