Techs & Trends
"Threaded messaging"
And as far at retreival goes would there simply be an single box full of these IM style messages to browse through?
https://www.phonescoop.com/glossary/term.php?gid=455 »
Text messages longer than 160 chars - sent as a series of smaller ones - are called concatenated SMS.
I think nearly all phones break up the messages automatically. Most newer phones will also re-assemble messages as they are received, to make it appear as if long messages are being sent with no limit. The network just sees the individual messages.