I don't know about agencies, but
I know for a fact that a lot of indies keep their entire text message history with their clients. Even irregular clients.
I know this because some girls whom I've seen more than once, but contacted with a different numbers, said:
"hey! I remember you! Why did you you contact me from a new number?"
It's probably safe to assume that agencies do the same.
It's understandable - they want to know if they have a history with you and if you are a good client or not.
It's very bad for your privacy though.
I know for a fact that a lot of indies keep their entire text message history with their clients. Even irregular clients.
I know this because some girls whom I've seen more than once, but contacted with a different numbers, said:
"hey! I remember you! Why did you you contact me from a new number?"
It's probably safe to assume that agencies do the same.
It's understandable - they want to know if they have a history with you and if you are a good client or not.
It's very bad for your privacy though.