On your Huawei device, you can choose your preferred network type for each SIM card. If you have a really bad connection, for example if you use 4G/LTE, you can change your network type to 3G.

Android 10 | EMUI 10.0
Preferred network type (2G/3G/LTE) -  Open the  settings
Preferred network type (2G/3G/LTE) -  Tap on  Mobile network
Preferred network type (2G/3G/LTE) -  Tap on  Mobile data
Preferred network type (2G/3G/LTE) -  Tap on  Preferred network type
Preferred network type (2G/3G/LTE) -  Choose between one of the given  options
  1. Open the settings
  2. Tap on Mobile network
  3. Tap on Mobile data
  4. Tap on Preferred network type
  5. Choose between one of the given options

Huawei Instructions
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