Please keep in mind if you are doing this to avoid "Call For Auth" on high swipes, pre-authing dumps will have little effect over this because the reason why you get Call for Auth is that many big electronic chain stores have a feature to make the transaction become Call For Auth, so it doesnt matter what dump you swipe, it will always display call if it is over a certain amount.
The best way to go about this is to swipe the dump without calling first, then call them with all the cardholder's information memorized on the spot in the shop you are currently in. Then yada yada, if bank decides to trust you and unblock it, strike second time, will avoid auto Call for Auth. If bank doesnt believe you and you haven't answered security questions enough them just say you need to go unfreeze a cheque or something retarded and leave.