You can remove calls from your call history in Hiya Spam Blocker on both Android and iPhone. You can delete everything at once or remove specific calls. Deleting your call history only affects the records stored in Hiya Spam Blocker on your device. Deleting call activity can't be undone.
Delete your entire call history
Open Hiya Spam Blocker and tap Settings.
Scroll down to the App Settings section.
Tap Delete call logs.
When asked "Permanently delete all call logs from Hiya on this device?", tap Delete.
Delete specific calls
Open the Calls tab.
Press and hold a call to start selecting.
Tap any other calls you want to remove, or use Select all.
Tap Delete.
On iPhone, your in-app call history is the list shown in the Calls tab. (This list is built from Call Screening, so it will only have entries if you've used Call Screening.)
Delete specific calls
Open the Calls tab.
Swipe left on the call you want to remove.
Tap Delete.
Delete your entire call history
A "delete all" option is available in older versions of the app:
Open the app and tap Settings.
Under Call Logs, tap Delete call logs.
When asked "Are you sure you want to delete all call logs?", tap Delete.
Some older versions of the app do not include a Delete call logs option in Settings. Instead, you can remove calls individually from the Calls tab using the swipe-to-delete steps above.
Note: Clearing your history in Hiya Spam Blocker doesn't change the Recents list in your iPhone's default Phone app. To clear that, open the Phone app, go to Recents, tap Edit, and delete entries there.