I got one of those scam texts last week that begin with "Dad save my new number..." it then escalated to where they asked for money.
(I knew it wasn't genuine as I'm still paying for my daughter's cellphone)
Anyway, I played a long for a bit but finally told them that I knew it wasn't genuine as my daughter is not that polite when she asks for money.
The age old "hey it's me ur brother" scam.
The oldest version I heard of was in Japan in the 1990s. Scammers would call elderly people, claiming to be grandchildren, and demand money or they would be arrested/scandalized.
It was called the "ore ore" (pronounced "o-ray o-ray") scam because they would typically use the word "ore" for "I", a familiar and often brusque or aggressive form of the first person singular.
This is also well known here in Hungary, there was even movie about it. It's called "unokázás"; literally: "grandchilding".