If you delete a group text message on iPhone, will it be deleted from all the people in the group?

I've send a text message I probably shouldn't have in a group text to 20 people and I wanted to delete it, but I was wondering if I delete that text, will it be deleted from the other people's phones also?

No, it's only deleted on your phone.

Nope. Unless they delete the message on their own phone, it will be on the group text message even if you delete the entire thread on your phone.