On September 3rd, I sent a text message to 10086, which was probably a string of letters, and then I opened a free 1G traffic package (what is it probably called?

Dear customers, in order to thank you for your continued support, we have prepared a free trial package of 1G provincial 4G dedicated traffic for you to try for free for 7 days, which will take effect within half an hour. Warm reminder: If you do not apply for a 4G package or activate the traffic guarantee service, the 4G Internet function will be stopped after the experience expires. Enjoy high-speed 4G, 4G Internet packages and business travel packages have been fully upgraded, and there will be no price increase for additional amounts. If you need to know and apply for more discounts, please reply to JSSW for Global Communications, and reply to JS4GLLW for M-Zone and Shenzhouxing. China Mobile