HI yes your old sim card will work in HTC wizard phone only if it is unlocked one .Else if the phone is locked to some other network provider then you can't use it with old sim card until you unlock it .You can easily get your HTC wizard phone unlocked from network lock using sites like TheUnlockSpot.com they are providing unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone ...