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To reduce the amount of data used in video calls and meetings on your mobile device, you can change a setting in the Teams mobile app to limit the amount of data used on your device.
Teams will still provide a quality viewing experience while balancing the number of participants, bandwidth conditions, and other factors.
To change this setting:
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Tap your profile picture and then select Settings 
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Select Data and storage and then Reduce data usage.
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Select one of the following options: Never, On cellular networks, or Always.
To reduce data usage in video calls and meetings, choose On cellular networks (for when you're using cellular data) or Always (for both cellular and Wi-Fi connections).