The device is most likely set to an LTE network mode.
With LTE devices, we recommend setting the network mode to 3G for a more stable network connection.
You can check/adjust this device setting as follows:
Android: Go to Settings > More networks / settings > Mobile networks > Network mode > set to 3G/2G auto mode or GSM/WCDMA (not 4G/3G/2G auto mode or LTE/GSM/WCDMA)
iOS: Go to Settings > Mobile Data > Mobile data Options > Voice & Data > set to 3G (not LTE or 4G)
Windows: Go to Settings > mobile+SIM > Highest connection speed > set to 3G (not LTE or 4G)
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