How to Convert Airtel Postpaid to Prepaid?

You cannot complete this migration fully online. You must visit the nearest Airtel Store (preferably a Corporate Store, not a small dealer).
Rule: Your Postpaid connection must be active for at least 90 days before you are eligible to switch back to Prepaid.

Unlike "Prepaid to Postpaid" which takes one click in the app, the reverse process is intentionally difficult. Airtel wants to keep high-value Postpaid customers.
If you try to do this via the Airtel Thanks App (Help section), it only raises a "Service Request." This triggers a call from the Retention Team who will offer you discounts to stay. To actually force the switch, you need physical biometric authentication at the store.

Checklist

• 90-Day Lock-in: If your Postpaid plan is less than 3 months old, the system will reject the request automatically.
  
• Airtel Black Status: If this number is part of an "Airtel Black" (Fiber + Mobile) bundle, you must de-link it first via Customer Care (121). You cannot migrate a bundled number.
  
• The Hidden Requirement: The "Pro-Rata" Calculation. Do not look at your last bill. You need to pay the "Unbilled Amount" (usage from your last bill date until today). The store can see this exact figure on their screen.
  

Step-by-Step Guide

• Step 1: Timing is Key
  Visit the store 2-3 days before your billing cycle ends. (e.g., If your bill generates on the 20th, visit on the 17th). If you visit on the 21st, you have already started a new month and may be liable for that month's rental.
  
• Step 2: The Store Visit
  Carry your Aadhaar Card and the phone with the SIM inside. Tell the executive: "I want to migrate to Prepaid. I do not want a discount."
  
• Step 3: Clearance & OTP
  They will check your unbilled dues. Pay this amount immediately via UPI/Cash.
  You will receive an OTP on your phone. Share this with the executive to authorize the migration.
  
• Step 4: The FRC (Mandatory)
  You must pay for a First Recharge (FRC) at the store (usually ₹299 or ₹479). The SIM will effectively be "dead" for about 2 hours, after which the new Prepaid plan activates automatically.
  

How It Works & Hidden Details
The "Data Rollover" Loss:
If you have accumulated 150GB of "Data Rollover" in your Postpaid account, it will vanish the second you migrate. It does not carry over to Prepaid. Use it or lose it.

The Security Deposit:
If you paid a deposit (e.g., ₹500) when joining Postpaid, this is usually adjusted against your final unbilled amount. If the deposit > dues, the refund process is slow (often requires a cancelled cheque submission). It is smarter to run up a bill equal to your deposit before switching so it nets off to zero.

Things to Watch Out For

• Risk 1: SMS Blackout. As per TRAI rules, incoming and outgoing SMS (including Bank OTPs) will be blocked for 24 hours after the migration. Do not do this if you have urgent banking to do the next day.
  
• Risk 2: The "Request Cancellation" Trick. Sometimes, after you leave the store, you get a call saying "Press 1 to confirm migration." If you miss this call or press 2, the request is cancelled. Watch your phone closely for 4 hours after the visit.
  

Frequently Asked Questions

• Q: Can I keep the same SIM card?
  A: Yes. In 99% of cases, the migration happens on the existing SIM (Over-The-Air). You rarely need a physical SIM swap unless your SIM is very old.
  
• Q: Will my unused data carry forward?
  A: No. Prepaid and Postpaid accounts are separate wallets. Nothing carries forward except your phone number.
  

Update: Additional Details & Recent Changes

• Lock-in Period Reduced to 30 Days (First Switch):
  As per the latest DoT guidelines (effective mid-2025), the mandatory cooling-off period has been reduced from 90 days to 30 days for the first conversion (Prepaid → Postpaid → Prepaid). The 90-day rule now only applies if you are a "habitual switcher" (i.e., making a second or third switch on the same number).
• The "App-Based" Migration Route:
  While a store visit is still the most reliable method, the **Airtel Thanks App** (Help Section > Chat) now supports an "Upgrade to Prepaid" workflow. This allows you to raise the request and pay the pro-rata amount online. However, it often triggers a "Retention Call" where you must verbally confirm the downgrade. If you clear the unbilled dues via the app link sent by the agent, you *might* avoid the store visit entirely, provided your KYC is up to date.
• Security Deposit via NEFT (No Cheques):
  The refund process for Security Deposits has been digitized. You no longer need to submit a cancelled cheque. Instead, look for the "Refund Bank Details" link in the Airtel Thanks App or website after your final bill is generated. Refunds are credited via NEFT within 10 working days of submitting your account details.
• Loss of "Perplexity Pro" & "Black" Coupons:
  Migrating to Prepaid immediately forfeits high-value bundled benefits like the Perplexity Pro AI Subscription (a standard perk on ₹449+ plans in 2026) and any unused **Airtel Black Coupons** (the ₹100 vouchers). These cannot be recovered even if you switch back to Postpaid later.