eSims iPhone 13
How many eSims can I install in my iphone 13?
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For information about the number of eSims that can be installed on an iPhone, see the following from: Use eSIM while traveling internationally with your iPhone - Apple Support
On your iPhone, you can store eight or more eSIMs, which will be there whenever you need them.
Also note that on an iPhone 13, you can have two of those eSims active at the same time. See the following from Using Dual SIM with an eSIM - Apple Support
iPhone 13 models and later also support two active eSIMs.