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An app user may have several phones. When they sign into their account on your mobile application, it is important that additional phones also provide access. Seam facilitates this access by registering each phone within the user identity and synchronizing mobile credentials across these phones. Further, Seam provides a feature to deactivate a phone if an app user loses it.

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App User New Phone Process

When an app user signs in to a new phone, Seam can automatically set up the new phone, generate matching credentials, and issue these credentials. To facilitate this capability, you must issue a multi-phone sync credential when creating a mobile credential.

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App User Lost Phone Process

If an app user loses their phone or wants to deactivate it, you can deactivate the phone. Seam then automatically invalidates the stored credentials on their deactivated phone. To deactivate a phone, provide the ID of the phone. When a phone is deactivated, Seam also revokes all the credentials issued to the deactivated phone. Seam also removes the associated ACS credentials from the ACS.
Command:
await seam.phones.deactivate({
  device_id: lostPhoneId,
})
Output:
// void

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Retrieving Phones for a User Identity

To retrieve the list of phones that the mobile app user has used to sign in to their account, use the List Phones endpoint and include the ID of the user identity.
Command:
await seam.phones.list({
  owner_user_identity_id: user_identity.id,
})
Output:
[
  {
    "device_id": "22222222-2222-2222-2222-444444444444",
    "device_type": "android_phone",
    "created_at": "2025-01-01T10:40:00+00:00",
    ...
  },
  {
    "device_id": "22222222-2222-2222-2222-555555555555",
    "device_type": "ios_phone",
    "created_at": "2025-01-02T10:40:00+00:00",
    ...
  },
  ...
]

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Retrieving a Phone by ID

To retrieve a phone by its ID, use the Get Phone endpoint and include the device_id of the phone.
Command:
await seam.phones.list({
  owner_user_identity_id: user_identity.id,
})
Output:
[
  {
    "device_id": "22222222-2222-2222-2222-444444444444",
    "device_type": "android_phone",
    "created_at": "2025-01-01T10:40:00+00:00",
    ...
  },
  {
    "device_id": "22222222-2222-2222-2222-555555555555",
    "device_type": "ios_phone",
    "created_at": "2025-01-02T10:40:00+00:00",
    ...
  },
  ...
]