Changed my number, but people can still text?

I recently changed to a new number for my iphone 4s, but how come people from my contacts can still text me when i haven't given them my number yet? My friend says when i text her my old number appears in a new window and when she texts me its in a window with my new number. How can i fix this? I don't want certain people to know my new number! This was all done in imessage by the way.

Probably cause its connected or u sent a message saying your new number

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