How to send messages to multiple people on an iphone?

I just got an iphone 4, and I need to send a message to everyone on my contact list so they know i have a new number. But is there a way to do it without making it into a group mms? I don't want people to know who else I sent the message to. I also don't want to send a message to everyone individually because that takes too much time.

Selective mass

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