Paying for some help

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http://forum.xda-developers.com – I have a HTC Evo Design 4G from Sprint. It is GSM and CDMA capable. I bought an unlock code from some site that I am being told is useless because this phone is not designed to prompt for or accept an unlock code in any scenario. I tried going through some steps using the htcdev app on the web page, but I have had no success in getting the phone to be truely unlocked. I have a SIM from AT&T that I would like to use with this phone. I have the HTC drivers installed, the Android SDK, platform tools, and other tools installed, and I tried going through the steps on htcdev with no luck. (HowTos)