OPPO mobile phone data network roaming is abnormal.

Investigation on international roaming anomaly of data network;

1. If the mobile phone is down, it should not support the network standard/frequency band of the local operator.

2. Insert the SIM card into other mobile phones to try whether there is service or call the operator to check whether the mobile phone has international roaming service.

3. It is necessary to confirm the network information with the local operator, who may not have signed a roaming agreement with the domestic operator.