A device account number is the unique substitute number your phone or smartwatch uses in place of your real card number every time you pay through a mobile wallet. It’s generated when you add a card to Apple Wallet, Google Wallet, or Samsung Wallet, and each device gets its own. You can view the last four digits inside the wallet app on the device itself.
What a Device Account Number Actually Is
When you load a credit or debit card into a digital wallet, your bank and the card network create a separate identifier that stands in for the sixteen-digit number printed on the plastic. Some wallets call it a token or a virtual account number; the function is the same. It’s tied to the specific piece of hardware you added the card on, so the same Visa loaded on your phone and your watch produces two different device account numbers.
This is called payment tokenization. EMVCo, which sets global standards for chip and digital payments, describes it as replacing a primary account number with a unique alternative value that can be restricted to a single device, merchant, or transaction type.1EMVCo. EMV Payment Tokenisation: What, Why and How Your bank keeps a secure mapping between the token and your real card, but the token itself can’t be reverse-engineered into your card number.
The security benefit is straightforward. If a merchant’s systems get breached, attackers walk away with a token that only works on your specific device. Your underlying card number never touched the merchant in the first place.
Where to Find Your Device Account Number
All three major wallet apps show only the last four digits. That’s enough to match a purchase on a receipt or confirm which identifier ran during a return.
iPhone (Apple Wallet)
Open the Wallet app and tap the card you want to check. Tap the Card Number button to see the last four digits of the device account number — the value your iPhone actually transmits when you use Apple Pay.2Apple. Set Up Apple Pay in Wallet on iPhone Tap the More button and then Card Details for the full view. Apple lists the physical card number and the device account number separately, so it’s easy to tell them apart.
Android (Google Wallet)
Open Google Wallet and tap the payment card at the top of the screen. You may need to swipe left to find it. Tap Details at the bottom, then Virtual account number. The last four digits shown are the device account number for that card on that phone.3Google Wallet Help. Where’s My Virtual Card Number for My Credit Card in Google Pay?
Samsung Wallet
Open Samsung Wallet, scroll to the card, and verify with a fingerprint or PIN. The virtual account number, which is Samsung’s label for the same thing, appears in the card details. Only the last four digits are visible.
How the Number Gets Used at Checkout
When you hold your phone near a payment terminal, it communicates over Near Field Communication. Two pieces of information travel to the terminal: the device account number and a one-time cryptogram generated just for that transaction.
The terminal forwards both to the card network through the merchant’s processor. The network recognizes the token, maps it back to your real account, and routes the authorization request to your issuing bank. If the bank approves, that answer travels back through the network to the merchant.1EMVCo. EMV Payment Tokenisation: What, Why and How The merchant stores the device account number and a transaction ID, never your actual card number, and because the cryptogram changes with every purchase, intercepted data from an old transaction can’t be replayed.
Returns and Refunds
Because the merchant’s records show only the device account number, a refund has to match back to that same token. Apple’s own guidance notes that merchants “might use the Apple Pay card number of your payment card in Wallet, instead of the debit or credit card number from your physical card.”4Apple. Get a Refund for Purchases Made With Credit or Debit Cards Using Apple Pay
In practice, bring the same device you used at the register. Some merchants will ask for the last four digits of your digital wallet card number; others can pull the transaction without it.4Apple. Get a Refund for Purchases Made With Credit or Debit Cards Using Apple Pay Handing over the physical card instead of tapping the device produces a mismatch and can force the clerk to process the refund manually. If the original device is gone — lost, traded in, or reset — tell the merchant so they can search by date, amount, or receipt number.
If Your Phone Is Lost or Stolen
Your real card number isn’t stored on the phone, so a thief can’t extract it from the device. You can also suspend the tokens remotely.
On Apple devices, sign in to iCloud.com/find or use the Find My app on another Apple device and put the missing device in Lost Mode. Apple suspends payment cards and other services immediately.5Apple Support. Use Lost Mode in Find Devices on iCloud.com If you get the phone back, turn Lost Mode off and sign in; the cards work again without being re-added.
On Android, open Google’s Find Hub (formerly Find My Device), select the phone, and choose Secure device. That locks the phone and can also remove cards from Google Wallet.6Android. What You Should Do if You Lose Your Phone
Suspending a device account number doesn’t cancel your underlying bank account or the physical card. Call your bank anyway; a lost-phone report gives them a reason to watch the account more closely.
When Your Card Is Replaced
If your bank sends a new card because the old one expired, was lost, or was compromised, the token service usually updates the link on its own. Your wallet keeps working while you wait for the new plastic to arrive. If the automatic update doesn’t happen, the wallet app will prompt you to verify the new card or re-add it, and the device will receive a new device account number tied to the replacement.
When You Get a New Phone
Device account numbers don’t move with you. Each device generates its own token when a card is added, and that’s true even when you restore from a backup — the tokens are hardware-bound.
Before you trade in or reset the old phone, remove your cards from its wallet app. Skipping that step sometimes produces an error on the new phone saying the card is already linked to another device. If it does, remove the card through the wallet provider’s website or ask your bank to release the old token.
Once the card is set up on the new device, the new device account number becomes the identifier for future purchases. Refunds still pending against the old token will land in your bank account normally, because your bank maps both the old and new tokens back to the same underlying card.