BitcoinWireless has not yet launched either. That least BTCBuy as the sole remaining source. Each month I refill my mobile phone service (currently Virgin Wireless prepaid, previously T-Mobile prepaid) and use either CellCoin or BTCBuy and have had great experiences with both.
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http://en.bitcoin.it/wiki/Trade#Mobile_Phone_Refill_CodesThanks to uncertainty introduced by FinCEN, BTCBuy is gone too. Time to start lobbying the carriers to accept Bitcoin?