By default, your own phone number will be transmitted to your interlocutor. The Huawei device uses the standard network settings of your mobile carrier. Sending the caller-ID can be surpressed if wished. This setup will be saved on your SIM card. 

Note: If you use dual SIM cards, you can activate or deactivate sending the caller ID individually.

Android 10 | EMUI 10.0
Step 1:  Open the  Phone App
Step 2:  Open the  menu
Step 3:  Open the  settings
Step 4:  Tap on  More
Step 5:  Tap on  Caller-ID
Step 6:  Choose between  Network default ,  Hide number  or  Show number
  1. Open the Phone App
  2. Open the menu
  3. Open the settings
  4. Tap on More
  5. Tap on Caller-ID
  6. Choose between Network default, Hide number or Show number

Huawei Instructions