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You can use your SIM card and Gigago eSIM at the same time if your phone is of the iPhone 13 series (13, 13 Pro, and 13 Pro Max) and later models. These versions allow you to use two eSIMs at the same time.
No other phones have this feature.
Many phones allow you to add multiple eSIMs in one device, but only one eSIM is activated at a time.
