That's probably because the BTC price went up. Let's just see what will happen if the price crashes.AT&T will most likely cancel all crypto payments.
This is the reason why they partnered with BitPay to insulate the company with the well-known bitcoin volatility. Now, when bitcoin can go down, the reason if AT&T will cancel the bitcoin option can be because no one is anymore using bitcoin to pay their bills. But the same thing can happen months from now if they realize that their expectation of the volume of transactions coming from bitcoin is disappointing. Let's keep our fingers crossed that this experiment can come with flying colors so that other merchants can also be following the move of AT&T.