Sync and blocking on iPhone

Call extension
NoCall uses the iOS integration for call identification and blocking. After you enable the extension in Settings, the app syncs approved numbers so iPhone can recognize them during an incoming call.

Sync
You can sync manually from the app. Depending on the app version and your plan, NoCall may also offer automatic and incremental sync to keep the local database updated with less manual work.

Blocking
Identification shows signals for known numbers. Silent blocking and range blocking are advanced controls and should be enabled only if you want iOS to handle those calls more strictly.