My 29 yo daughter died in May and I called AT&T to find out if LE could access her records even if I ended her phone service. AT&T told me that they kept records of texts and phone logs for 18 months and maybe could even get older records under some circumstances. AT&T said they needed a warrant from LE to provide the info and could not give it to me even if my daughter was on my family plan. AT&T said they could even provide transcripts of text messages between my daughter’s iPhone and other types of phones. However, iMessages between 2 iPhones would have to be requested from Apple (also with a warrant) if my daughter had an iCloud account that backed up her phone, which she did. Apple will not unlock phones even if LE asks them to. Just FYI my daughter died of an OD, which NC investigates as a homicide. I let the detective know the information from AT&T, but I don’t know if NC LE ever got a warrant for AT&T or Apple. I gave LE her phone and text logs. All this to say I don’t think BL getting a new phone will preclude LE from getting data on his old phone from AT&T and/or Apple.