Do I need to apply for the SMS access number of 1069 or 1066 for collaborative office cloud services?

1069 is definitely better than 1066. The SMS number 1069 is an industry-specific number segment approved by the Ministry of Industry and Information Technology. Enterprises can apply for the number 1069 by themselves. After applying for the number, they need to apply for a channel binding number from China Mobile, China Unicom and China Telecom, so that the number 1069 can become a channel for sending and receiving short messages. The advantage is that the sending and receiving numbers of the three networks are unified. 1066 is the SMS channel number assigned to you by the mobile company immediately. You can only send your mobile phone number. If it is the mobile phone number of China Unicom or China Telecom, you can only take the channel of China Unicom, and the number is different. For details, please consult Jiangsu Meisheng Information Technology Co., Ltd., which provides operator-specific channels such as 1069.