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If an eSIM-compatible phone has a SIM card (currently in use), what happens to the phone's existing voice/SMS services if an eSIM data plan from another operator is added?
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In conclusion, these services will remain operational unless the user chooses to disable them via their phone's settings. The device's operating system provides instructions for designating primary and secondary SIM cards, allowing users to manage their calls, SMS messages, and data usage in advance. It is also possible to link two phone numbers to the same device, and adjustments to these settings are easily made if needed.