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You want the DigiD app to use.
For that, your phone usually has a NFC reader necessary.
Not every phone has an NFC reader.
Does your phone No NFC?
Then you use the CheckID app.
The CheckID app put yourself on a other phone.
That phone It does have NFC.
With that phone, you help your own phone.
This way you can the Activate DigiD app, even without NFC.