Audience > Subscriptions shows a list of every subscription in your OneSignal App, and Data Collected by the OneSignal SDK. More details in our Users guide. There are 3 types of subscriptions. Check the Channel and Device columns for each:

Push Subscription

Can be sent push notifications.

Email Subscription

Can be sent email messages.

SMS Subscription

Can be sent SMS and MMS messages.
Android, iOS, Huawei and Amazon mobile app push subscriptions can also get In-App Messages.
You can search for a user and all associated subscription records by the External ID or OneSignal ID (details in Aliases & External ID). If you don’t know the ID of the user, you can search by email address or phone number to find it. Set any subscriptions for a given user to be test subscriptions to make it easier to find them. You can show/hide the data attributes with the columns button (1), search by Subscription ID, OneSignal ID, External ID, Email or Phone Number (2) and filter by Segments (3).

Steps from the 'Subscriptions' tab

​
Test Subscriptions

Test Subscriptions are a group of records that you manage directly in order to test delivery of messages. To add your device as a Test Subscription:
  1. First find your subscription. There are several options listed below.
  2. Once you have your External ID, OneSignal ID or Subscription ID, you can search for it (1), then next to the device record select Options > Add to Test Subscriptions (2).
Next you can Segment devices by Test Subscriptions Filter and/or send messages using the Send To Test Device Button.

​
Finding Subscriptions

There are a couple options for finding your device depending on the data you currently have.