Which mobile phone card in Zhangjiagang has the highest cost performance?

I am in Zhangjiagang, and most of my friends are mobile. There are fewer people using Unicom and the signal is not very good. I used to use my mobile phone, but now I have changed to PHS. Long-distance call is 20 cents/minute, after 10 in the afternoon 1 cent/minute. There are also local calls 1.5/ min, and long distance calls are 30 cents/min. Now PHS has smart phone service. When PHS with separated phone and card goes to other cities in the province, you can dial 1 1832 1, and the system will automatically assign you a local temporary number. At the same time, all incoming calls and text messages from your original number will be transferred to the new temporary number to realize remote location.