Charge the phone charge to the secondary card, how to do?
My answer is as follows: Telecom's phone cards with primary and secondary cards belong to one account. The secondary card can also be charged, and the use will not be affected. This is like the secondary card, not enough to use the main card's phone bill. This is to facilitate the cost of the phone, after use is not convenient enough for the sake of it! In fact, this rule is very good.