Do not pick up the call, use WhatsApp/Wechat to call back.
Get a local SIM if you need to stay a bit longer. I actually maintain a China Mobile SIM card (RMB18 per month) to receive SMS verification codes of apps. Then I can use it when travel to China as well. Data is charged only when used at RMB1 per day for 1GB per day. I am using a dual sim Android phone Huawei P20.
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