How to Convert Vi (Vodafone Idea) Postpaid to Prepaid?

You cannot do this online. You must visit the nearest Vi Store (or Mini Store).
The process requires physical biometric verification (KYC). You must clear your "Current Unbilled Amount" at the counter.
Rule: You must be a subscriber for at least 90 days before you can migrate.

Postpaid users generate higher revenue (ARPU) than Prepaid users. Telecom operators intentionally make the "Exit" process offline to give their Retention Team a chance to convince you to stay.
If you call Customer Care (199), they will simply log a request but will eventually tell you to "Visit the Store" to complete the KYC and billing settlement.

Checklist

• Physical Presence: The connection holder (whose name is on the bill) must visit personally for biometric fingerprinting.
  
• Documents: Original Aadhaar Card (or valid PoI/PoA) and your active phone.
  
• Money: Carry cash/UPI for the "Unbilled Amount" (usage from the 1st of the month till today) + ₹299 (approx) for the First Recharge (FRC).
  
• The Hidden Requirement: The "Safe Custody" Trap. If you have any active "Add-on" connections (Family Pool), you must de-link them before you visit the store. You cannot migrate the Primary Number if Secondary numbers are still attached to your bill.
  

Step-by-Step Guide

• Step 1: Timing Your Visit
  Check your Bill Cycle date (usually the 1st, 10th, or 20th). Visit the store 3 days before your cycle ends.
  Why? If your cycle ends on the 20th and you visit on the 22nd, you might be forced to pay the rental for the entire new month just for using 2 days.
  
• Step 2: Clear the "Unbilled" Dues
  The store executive will generate a "Tentative Final Bill." This includes your previous month's bill + usage till the current minute. Pay this immediately at the counter.
  
• Step 3: Biometric KYC & OTP
  They will scan your fingerprint or take a live photo. You will receive an OTP on your current number to confirm the migration.
  
• Step 4: The Sim Swap (Optional)
  In most cases, Vi allows "Migration on Same SIM". However, some franchise stores may force you to buy a new SIM card (₹10-₹50) to meet their sales targets. If they insist, just take the new SIM; it activates faster.
  
• Step 5: The "FRC" (First Recharge)
  You must select a prepaid plan (e.g., ₹299 for 1.5GB/day). This is called the FRC. You pay for this at the store, but it only activates after the migration is complete.
  

How It Works & Hidden Details
The "Retention Call" Barrier:
Once the store submits the request, your phone might get a call from the "Retention Department" within 24 hours. They will offer you a 50% discount on your Postpaid rental for 6 months.
Action: If you are determined to switch, firmly say "No." If you accept the offer, the Prepaid migration is cancelled instantly.

The "Security Deposit" Refund:
If you paid a security deposit (e.g., ₹500) when you took the Postpaid connection years ago, it is adjusted against your final bill. If there is a surplus, Vi is supposed to send a cheque to your address, but this rarely arrives. Demand that they adjust it fully against the FRC or Unbilled amount.

Things to Watch Out For

• Risk 1: Loss of Data. "Rollover Data" (the 200GB you saved up) will vanish the moment you switch. Use it or lose it.
  
• Risk 2: OTP Block. After migration, you will not receive SMS (OTPs for Bank/Aadhaar) for 24 hours due to TRAI security regulations. Plan your banking transactions accordingly.
  

Frequently Asked Questions

• Q: Can I keep my number?
  A: Yes. The number remains exactly the same.
  
• Q: Will Netflix/Prime continue?
  A: No. Any OTT subscriptions bundled with your Postpaid plan will stop immediately upon migration.
  

Update: Additional Details & Recent Changes

• Lock-in Period Reduced to 30 Days (DoT 2025 Update):
  The mandatory lock-in period for switching between Postpaid and Prepaid has been reduced from 90 days to 30 days for the first conversion. You can now migrate your connection just one month after activation. However, for any subsequent switch (e.g., swapping back and forth), the 90-day rule may still apply.
• Online Refund for Security Deposit:
  If the store refuses to adjust your security deposit against the final bill, you no longer have to wait for a physical cheque. Vi has launched a Refund Registration Portal on their website (`myvi.in/postpaid/neft-details-for-refund`). You can update your NEFT/UPI details there to receive the unadjusted deposit directly into your bank account after the final bill generation.
• Mandatory New SIM for Postpaid-to-Prepaid:
  Unlike "Prepaid to Postpaid" which is often done via OTP on the same SIM, the reverse process (Postpaid to Prepaid) almost always requires a new SIM card at the store. This is because the underlying HLR (Home Location Register) profile changes significantly. Be prepared for a SIM swap, which triggers a mandatory 24-hour SMS outgoing block for security.