Dual SIM iPhone, what is the relationship between "main" and "secondary"?

Dual SIM is managed by the names "main line" and "secondary line" on the iPhone. Basically, the SIM that was used first is treated as the main, and the added SIM is treated as the sub, but it is not that the sub line is only an auxiliary role, and the sub line is the main depending on the setting. It can also be used as a (mainly used) line.

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