Mobile data is consumed abnormally on my HUAWEI phone/tablet

Mobile data is consumed even when the device is connected to a Wi-Fi network

This may be because you have enabled Wi-Fi+ or Network Acceleration, or are using special apps (such as WeChat and QQ). For more details, please refer to My phone still consumes mobile data when connected to a Wi-Fi network .

The secondary SIM card is consuming data

Go to My HUAWEI > Support > Quick services > More > Smart Diagnosis > Communication & network and perform a smart diagnosis.

If the diagnosis indicates that the SIM card is faulty: The primary SIM card cannot be identified, so the secondary SIM card is used for mobile data consumption. In this case, it is recommended that you go to your carrier's customer service center to apply for a new primary SIM card.
If no fault is detected: Once the secondary SIM card establishes a connection with the 4G network, it will consume a small amount of data, even when Mobile data is disabled, as the network will send special data packets to the card, or when the card receives MMS messages. Perform the following steps:
1. Go to Settings > Dual SIM settings/SIM management and disable Internet access during calls/Switch data connection during calls/Smart Data Switch.
2. If you do not want the secondary SIM card to consume data when receiving MMS messages, perform the following:
  1. Disable network access permission for messaging. To do so, go to Tablet Manager/Optimizer > Mobile data > Networked apps, find and tap Messaging, and disable Mobile data.
    
    Network access permission for Messaging cannot be disabled on certain devices. Actual interfaces may vary.
  2. You can contact your carrier to cancel the MMS service.
3. You can also contact your carrier to deny network access to the secondary SIM card.
For more information about mobile data consumption, please contact your carrier for a detailed mobile data usage record that will contain the websites or IP addresses that consume your device's data.

Email app automatic synchronization is consuming data

After automatic synchronization is enabled in the Email app, photos or videos in emails will be automatically loaded, which consumes mobile data. You can adjust Sync frequency and Number of emails loaded at a time as required.

Adjust Sync frequency	Adjust Number of emails loaded at a time
Open Email, tap the ∷ icon in the upper left corner, select Settings, select the account for automatic synchronization, and select 15 minutes.	Open Email, tap the ∷ icon in the upper left corner, go to Settings > Number of emails loaded at a time, and select 25 emails.

If you enable the auto-download of Email attachment and Wi-Fi+ features, mobile data will be enabled when the network condition is poor. Attachments will be downloaded using mobile data, resulting in increased mobile data consumption. You can disable Download attachments and Wi-Fi+.

Disable Download attachments	Disable Wi-Fi+
Open Email, tap in the upper left corner, go to Settings > Number of emails loaded at a time, and disable Download attachments.	Open Settings and go to Wi-Fi > More Wi-Fi Settings > Wi-Fi+ on your phone/tablet.

The operating system is consuming data

App database updates will consume mobile data. To resolve this issue, perform the following:

Set updates to be downloaded only over Wi-Fi	Disable the Internet access permission for rarely-used apps	Set cloud sync to be available only over Wi-Fi
Open Tablet Manager/Optimizer, select Blocked, tap Block rules or in the upper right corner of the screen, and set Update number database to WLAN only/Wi-Fi only. Open Tablet Manager/Optimizer, tap in the upper right corner, and go to Antivirus software update/Online virus scan > Wi-Fi only.	Open Settings, search for and access Apps, tap an app that is not frequently used, go to Data usage > Mobile data/Network access, and disable Mobile data. This is because some native services are not controlled by the network connection status of the app, and still use a small amount of mobile data even after Mobile data and Background data have been disabled.	Open Settings, go to Cloud > Gallery, and disable Download over mobile data.

Set updates to be downloaded only over Wi-Fi

Disable the Internet access permission for rarely-used apps

Set cloud sync to be available only over Wi-Fi

Open Tablet Manager/Optimizer, select Blocked, tap Block rules or in the upper right corner of the screen, and set Update number database to WLAN only/Wi-Fi only.
Open Tablet Manager/Optimizer, tap in the upper right corner, and go to Antivirus software update/Online virus scan > Wi-Fi only.

Open Settings, search for and access Apps, tap an app that is not frequently used, go to Data usage > Mobile data/Network access, and disable Mobile data.

This is because some native services are not controlled by the network connection status of the app, and still use a small amount of mobile data even after Mobile data and Background data have been disabled.

Open Settings, go to Cloud > Gallery, and disable Download over mobile data.

If the issue persists

If the issue persists or you encounter any difficulties, please call the Huawei customer service hotline for assistance.