What is an "eSIM"?

The abbreviation "eSIM" means "embedded SIM":

  • Unlike the normal SIM card, it is permanently installed in the device as a small chip.
  • It measures 5 x 6 mm and cannot be replaced or removed.
  • An eSIM uses the same specifications as an ordinary SIM card.
  • So technically it doesn't matter whether you use an eSIM or the conventional SIM card format.
  • If you want to switch to a different phone provider, the eSIM is simply reprogrammed.
  • To do this, for example, with Apple iPhones you simply scan a QR code transmitted by the provider. Alternatively, you can use the provider app or enter the eSIM information manually.

eSIM: Differences to the normal SIM


New eSIM



Is already permanently integrated in the device

Must be plugged in


Cannot be taken out and will be reprogrammed when changing provider

Can be removed and replaced with other SIM

Dual – SIM

Some devices, such as the newer iPhones, offer the option of using an old SIM in addition to the eSIM.

Depending on the device, possible, for example, to use one SIM card as a cheap data tariff and the other SIM card for making calls.

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