How do i change the ringtone callers hear when they contact my htc wildfire

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In most cases, the ring tone callers hear (incoming ring tone) is controlled by your cellular service provider.

Try this first: (On the Internet) Sign-in to your cellular account. On your account page, look for a link that directs you to your incoming ring tones (or similar). There, you can change your incoming ring tone.

If you're unable to do that, contact your cellular provider's Customer Support. They can assist you in changing your incoming ring tone.