Hi Shyne22. I'd like to welcome you to Android Forums. I hope you enjoy your time here.
A major upgrade to your phone will take no effort from you. When/if there is an upgrade, it will be pushed to your phone automatically. All you will need to do is accept the upgrade. Your only other upgrade option is to root your phone and then flash a different rom onto your phone. We do not at this time have a root option for your phone. You are like all stock android phone owners... sitting and hoping an upgrade is coming out for their phone. I hope you enjoy these forums and we certainly are happy to have you as a new member.
The HTC Desire Z is an old phone within the HTC range. I have serious doubts that an upgrade to Android 4 will happen automatically as HTC is focusing on its newer models.
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