Mobile Wallet

A mobile wallet is a software application on a smartphone, smartwatch or other mobile device that lets its user store payment credentials or money and use them to pay in shops, online or to other people. Depending on the type, it may hold copies of bank cards, a balance of electronic money, a mobile money account or the keys to cryptocurrency. It is a form of digital wallet designed around the phone's features, such as its camera, wireless chips and biometric sensors.

Mobile wallets have become a mainstream way to pay. In many advanced economies, card-based wallets on phones handle a growing share of in-store payments, while in parts of Africa and Asia mobile money and app-based wallets have brought digital payments to people without bank accounts. In crypto, a mobile wallet is the most common way for ordinary users to hold and send coins.

A mobile wallet does the job of a leather wallet, but inside a phone. Instead of carrying cards and cash, the person carries a phone that can stand in for them. At a shop till, they hold the phone near the card reader or show a code on the screen; to pay a friend, they choose a contact and type an amount.

What sits behind the app varies. Some wallets simply hold a safe copy of an existing bank card. Others keep a balance of money with the company that runs the app, like a prepaid card. Crypto wallets hold the secret keys that control coins on a blockchain. The look can be similar, but who holds the money, and who protects it, is quite different.

• Card-based wallets. Apps such as those built into iPhones and Android phones store a tokenised version of a debit or credit card and pay through near field communication at contactless terminals. The underlying money stays in the user's bank or card account.
• Stored-value wallets. Apps run by payment companies hold a balance of stored value or electronic money that users top up and spend, often by scanning a QR code. Large examples in China and other Asian markets also serve as super apps.
• Mobile money. Services linked to a mobile phone number, often run by telecom operators, let users deposit and withdraw cash through agents and send money by text menu or app; see mobile money.
• Bank and real-time payment apps. Banking apps and wallets connected to instant payment systems, such as India's UPI, move money directly between bank accounts.
• Crypto wallets. Apps that generate and store the keys for blockchain addresses, either held by the user or by a company, as described under crypto wallet.

Card-based wallets rely on network tokenization: when a card is added, the card network issues a substitute number, or token, tied to that device. The real card number is never shared with the merchant, and each payment carries a one-time cryptogram that proves it came from the genuine device. Users approve payments with a fingerprint, face scan or passcode, which counts as strong authentication under many regulations.

Stored-value and mobile money wallets keep balances on the provider's ledger. When one user pays another on the same system, the provider simply moves the balance between their accounts, which is why such transfers can be instant and cheap. Funds move in and out through bank transfers, cards or cash agents.

Crypto mobile wallets create a seed phrase and private keys on the device, or hold them on the user's behalf in a custodial model. They connect to blockchain nodes to read balances and broadcast transactions. Many support several networks in one app, as described under multi-coin wallet, and some connect to decentralised applications in the manner of MetaMask.

Phones offer strong security features, including secure hardware for storing keys, app sandboxing and biometric locks, but they are also easy to lose and are targeted by malware and scams. Card-based wallets limit damage because tokens can be cancelled without replacing the card. Stored-value and mobile money accounts can be drained if attackers take over the phone number through SIM swapping or trick users into sharing codes. Crypto mobile wallets are hot wallets; if the seed phrase is lost or stolen, funds are usually gone for good. Security guidance includes using device passcodes and biometrics, keeping apps updated, installing apps only from official stores and storing recovery phrases offline.

The rules depend on what the wallet does. Card-based wallets ride on existing card and bank regulation. Providers that hold customer balances are usually licensed as electronic money issuers, payment institutions or, in the United States, as money transmitters, and must safeguard customer funds and run anti-money-laundering checks. Mobile money operators are supervised by central banks in most markets where they operate. Custodial crypto wallets increasingly fall under crypto licensing regimes and the travel rule, while self-custody wallet software is generally treated as a tool rather than a financial service. Consumer-protection rules on fraud, refunds and data privacy also apply, and vary widely between countries.