I have changed the SIM on my device to a different primary number, and now the app has stopped working. What should I do?

The secondary number in the application is “linked” to the main number on which it is installed. Therefore, if a SIM has been changed to another number, it is recommended that you transfer your Num2 account using the app menu and register it on the new main SIM number.
See “How to Transfer an Account“.

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