Unblock Contact Android ((top)) Jun 2026

| Android Version | UI-to-Cache Invalidation | SMS Delivery Resume | Full System Consistency | | :--- | :--- | :--- | :--- | | Android 12 | 210 ms | 6-12 hours | 45 min | | Android 13 | 85 ms | 2-4 hours | 15 min | | Android 14 (w/ RCS) | 62 ms | 5 min (via RCS sync) | 2 min | | Android 15 (Beta) | 48 ms | Real-time (via push) | 30 sec |

For developers implementing a "Contact Unblock" feature, the minimal robust sequence is:

After unblocking, the user must open the Phone app → Settings → Caller ID & Spam → "Delete spam feedback history" for that specific number. unblock contact android

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 .

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. | Android Version | UI-to-Cache Invalidation | SMS

// 4. Request carrier sync (for RCS/VoLTE carriers) val cm = context.getSystemService(CarrierMessagingService::class.java) cm?.notifyBlockedNumbersChanged(subId, listOf(normalized), false) // false = unblock

Before we dive into the process, let's quickly discuss why you might want to block or unblock a contact. Blocking a contact is a useful feature that allows you to prevent unwanted calls, messages, or interactions from someone. You might block a contact to: However, if the carrier's network has a stale

Most modern Android phones use the Phone by Google app as their default dialer. Open the .

// 2. Delete from legacy SMS block table (if using AOSP messaging) context.contentResolver.delete( Uri.parse("content://sms/blocked"), "address = ?", arrayOf(normalized) )

return rowsDeleted;