Why is my iPod touch using my iPhone's phone number for iMessage?

I don't know why it started doing it but my iPod says it's using my email and phone number on iMessage but I don't get why or how that's even possible. Please explain this.

Needs attention

Had the same problem, they are both linked to the same I-tunes account.
You can turn I-messages off on your iPod by going into Settings, then Messages and then you will see an I-message bar that will have a switch on it, move the switch to the left and this will stop messages going to I-pod.

IMessage is connected through your Apple ID and not your phone service. Your phone number has been added to your account. You can go into the iMessage section in Settings and turn the phone number off on the iPod.

IPods don't have phone numbers of their own.