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The SMS/MMS app maintains its own blocked table: content://sms/blocked . This table is not automatically synced with the BlockedNumberProvider on unblock. Google Messages and Samsung Messages use a periodic sync job (run every 6-12 hours). Therefore, unblocking a contact does not immediately unblock SMS delivery.
// 5. Reset local spam confidence for that number val pm = context.getSystemService(ProtectionManager::class.java) // Android 14+ pm.resetSpamFeedback(normalized) unblock contact android
| Artifact | Path / Key | Value on Unblock | | :--- | :--- | :--- | | settings.db | secure:blocked_numbers_list | Entry removed | | call_log | CALL_BLOCK_REASON | Changed from 1 to 0 (but old log retained) | | logcat (kernel) | Event: 0x12f4c | BLOCKLIST_REMOVE action logged | | telephony.db | carriers/blocked_entries | deleted=1 (soft delete) | The SMS/MMS app maintains its own blocked table:
// 3. Force telephony cache refresh val tm = context.getSystemService(TelephonyManager::class.java) tm.clearBlockedNumbersForSubscriber(subId) Therefore, unblocking a contact does not immediately unblock
// Delete from telephony provider context.contentResolver.delete(BlockedNumbers.CONTENT_URI, ...) // Also delete from SMS provider context.contentResolver.delete(Uri.parse("content://sms/blocked"), ...) // Force sync via Carrier Messaging Client SmsManager.getDefault().clearBlockedNumberForSubscriber(subId, phoneNumber) Carrier Call Filtering: For RCS (Rich Communication Services) and VoLTE, carriers (T-Mobile, Verizon, Jio) maintain their own block list on the IMS core. When a user unblocks a contact on Android, the OS sends a CarrierConfigManager update via the TelephonyManager . However, if the carrier's network has a stale cache, the number remains blocked at the network level for up to 24 hours .