One in Zhengzhou, one in Shangqiu, call with what is the cheapest, callback card signal is too bad.

There is a kind of telecom card, but need to do two, call free. There is also a monthly callback card nature, January 45 yuan randomly hit the province's cell phone, I am using this, feel good, did not encounter any problems, the night as usual, no sound quality is not clear what the situation. I want to I can give you a detailed introduction to ah