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# TelephonyCallback.ActiveDataSubscriptionIdListener

`public static interface TelephonyCallback.ActiveDataSubscriptionIdListener`
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android.telephony.TelephonyCallback.ActiveDataSubscriptionIdListener

Interface for active data subscription ID listener.

## Summary

### Public methods
`abstract void` | `onActiveDataSubscriptionIdChanged(int subId)` Callback invoked when active data subscription ID changes.

## Public methods

### onActiveDataSubscriptionIdChanged

    public abstract void onActiveDataSubscriptionIdChanged (int subId)

Callback invoked when active data subscription ID changes. Note, this callback triggers regardless of registered subscription.
Requires `Manifest.permission.READ_PHONE_STATE`

Parameters
`subId` | `int`: current subscription used to setup Cellular Internet data. The data is only active on the subscription at a time, even it is multi-SIM mode. For example, it could be the current active opportunistic subscription in use, or the subscription user selected as default data subscription in DSDS mode.

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