Unless you download an app to change it you are stuck with the default.
This was an app on Amazon?I bought (hey, I'm honest) one from amazon. It's very nice. Bought an entire set. It's a British chick and she says:
"You have a text message"
or
"You have an email"
or
"Excuse me. You have a call. Would you like me to take a message?"
This way I know exactly what type of message I'm getting without having to look.