📱 What is FDN Setting? (Fixed Dialing Number)

🔎 Introduction

FDN stands for Fixed Dialing Number. It is a SIM-based security feature that restricts outgoing calls. When enabled, your phone can only dial numbers saved in the FDN List, while all other numbers are blocked.

⚙️ How to Find FDN in Mobile Settings (Step-by-Step)

📱 General Path:
Settings → Network & Internet / Mobile Network → SIMs → [Your SIM] → Advanced / Additional → Fixed Dialing Numbers (FDN)

📞 Alternative (From Phone App):
Phone App → ⋮ Menu → Settings → Calling Accounts / Carrier Call Settings → [Your SIM] → Fixed Dialing Numbers

🔹 Brand-wise Quick Paths

• 📱 Pixel / Stock Android: Settings → Network & Internet → SIMs → [SIM] → Advanced → FDN
• 📱 Samsung (One UI): Phone → ⋮ → Settings → Supplementary services → FDN
• 📱 Xiaomi / Redmi / POCO: Settings → SIM cards & mobile networks → [SIM] → Advanced settings → FDN
• 📱 Realme / OPPO: Phone → ⋮ → Settings → Carrier call settings → FDN
• 📱 vivo / iQOO: Phone → Settings → Calling accounts → [SIM] → FDN

💡 Tip: Use search bar in Settings and type “FDN” to quickly find it.

🛠️ How to Enable FDN & Add Numbers

1️⃣ Keep your PIN2 Code ready (provided by SIM operator).
2️⃣ Go to Enable FDN → Enter PIN2.
3️⃣ Open FDN List → Tap Add Number → Enter Contact Name & Number.
4️⃣ Test by calling an allowed and a blocked number.
5️⃣ To disable/edit, turn off FDN or update the list (requires PIN2).

⚠️ If your SIM gets locked due to wrong attempts, you’ll need PUK2 Code from your operator.

✅ Advantages of FDN

✔ Increases security of your SIM.
✔ Perfect for parental control (kids can only call family numbers).
✔ Prevents misuse in corporate SIM cards.

❌ Disadvantages of FDN

✘ Incoming calls are not restricted.
✘ Forgetting PIN2 may lock your SIM.
✘ Not beginner-friendly; requires technical knowledge.

🔁 Language Switch

👉 Read this Article in Hindi ➝