[Scenemaker]

Let me clear something up here. Features such as voicemail, call forwarding (which is what your service uses when you don't answer a call to FORWARD it to your voicemail box), caller ID, call waiting and a few others are all network based services. None of which have anything to do with your device. Now I know some people will say, but my phone takes the number from caller ID and displays the appropriate contact. Yes this is true, however the actual caller ID function that determines what number is calling you is still network side, not device side.

Now how does this pertain to the question at hand? Well, there is no setting available in any device to change how many times it rings before FORWARDING to voicemail. Again, forwarding is set by the carrier. Now, is it possible for a carrier to allow a *function to change the network settings for this or any other service offered? Yes, but I have not seen the ability to change the number of default rings before it forwards, only to change what number it forwards to. There may be a carrier out there somewhere that does but generally speaking you must contact your carrier and ask them to change this on their end. Typically you want to keep it under 30 seconds before forwarding to voicemail as some carriers will bill you for a minute of service if your phone rings for longer than 29 sec. So in most cases, you will set it to 25 seconds as carriers generally only allow increments of 5 seconds to be set. Again, this is the way MOST carriers in the US work but it may not be true for yours.

Long story short, don't waste your time calling HTC.