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Step 1: Install the "Worry-Free" app in the appstore.

Step 2: Use the number of China Mobile to register the worry-free APP；;

Step 3: Enter the worry-free line, click the "Phone" tab, click "Phone Settings" in the upper right corner, and choose your mobile phone number by setting the outgoing phone number; Turn on the switch to receive incoming calls and text messages for free;

Step 4: Replace the sim card with another sim card. At this time, both incoming calls and short messages can be answered.