What is the most cost-effective mobile phone card in Shanghai?

If you need to know the Unicom package tariff standard, you can log in to Unicom online business hall and Unicom APP to learn about the package tariff and specific content launched by our company. Due to different policies in different cities, different businesses are launched. If you need to know more about the tariff package, you can contact the local Unicom customer service or consult the local Unicom business hall.