之前是付2次给$40
这次是付2次给$50，但是加了新条件：
Earn $50 cash back when you make two new, qualifying wireless plan payments of at least $37.50 each with AT&T Wireless using your eligible card associated with this offer.
Offer valid one time only for new AT&T Wireless customers.
意思是，老ATT用户拿不了了？