I know it's an old post but...swapping Sims isn't the solution. Dual SIM phones can have data/internet only from sim1 or sim2. If you checked mobile data on sim1 and receive a call on sim2 it's normal for the internet not to work because during the call sim1 is deactivated. You can use only a sim at a time. So change your data on the sim that u use most.
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