This tiny number can't make a call.

You mean why the tiny number can't be dialed? The network is not good

Check the network and redial. If not, you can ask the customer service staff. You can call if you are in a hurry.

Micro number is a WeChat applet product launched by Tencent. Users can apply for a new mobile phone number through micro number (without SIM card). Trumpet can be used to answer/make calls, send and receive short messages, support domestic voice and point-to-point short messages, and micro-number needs to be handled by real name, which effectively protects the privacy of local numbers.