Well, you'll have to insert each sim card in the phone in order to receive verification code.
Or you can buy one of these devices from Alibaba, but their damn expensive for chinese stuff.
Better get unlocked dual sim phone and verify those 100 accounts, it will take you couple of hours but at least you won't have to spend $1000+ on chinese merchandise.
BTW, current sale is is limited time offer, only while current supply of sim cards last, so hurry up with the order if you want them. We'll revert prices back to original ones ($5.00 per sim) very soon.