If you dont have accses to the phone, simply let the request time out on the first popup, not the one where you wait for the SMS, but the one where you have to click "Send a SMS", il get a screen shot next time it pops up to make it more clear.
If you wait for 30-40 sec, it will time out and post the auction, and it wont bother you for the next 10-20 auctions, simply repeat.