How many short messages can I send when my mobile phone has 20 yuan phone bill?

In fact, you often call and send text messages. I suggest you set up a 30 yuan package, which can save 500 minutes, and then open a SMS package. Or Unicom has random calls now. 16 yuan/month. You can call all Unicom numbers in the province for free, and 10 yuan can open 250 message packages. 20 yuan can hold 600 yuan. Very cost-effective. Hope to adopt, thank you.