Send a lot of text messages every month, but don't call. What card do I use?

The landlord doesn't know where it came from and what card to recommend to you. But I can tell you what I learned with my mobile phone for two years. There are more text messages than phone calls. Mobile chooses M-Zone, and Unicom chooses up new forces. They are specially designed for short message users (mostly students), but Unicom's tariff is relatively low, but the signal coverage is not as wide as mobile, so in some places, Unicom's short message delay will be more serious. If you don't call, you can use Zhejiang SMS to subscribe to the monthly card, which can be bought on Taobao. Landlord, my most loyal answer, comment on the answer, hehe.