Signal multi-device support has reached a long-awaited milestone on iOS. With Signal 8.22, an iPhone can operate as a secondary device linked to an existing Signal account, allowing users to send and receive messages from more than one phone without repeatedly moving their registration.
The update applies to the Signal app for iOS rather than to Apple’s operating system itself. It follows beta testing that began in July and expands a linked-device system that previously covered computers and iPads, but excluded additional iPhones.
That limitation made Signal inconvenient for people who routinely carry two phones. Installing the app on a second iPhone previously required registering that device as the account’s primary phone. Doing so disconnected the first phone instead of allowing both to remain active.
Version 8.22 removes that either-or arrangement. An additional iPhone can now remain connected as a linked device while the original registered phone retains its primary role.
Signal Multi-Device Support Reaches the iPhone
Signal has offered linked desktop applications for years, giving users access to encrypted conversations from macOS, Windows, and Linux. The iPad has also been supported as either a linked device or, in certain configurations, a separately registered device.
The iPhone was treated differently. Although the iOS app already contained much of the technology needed to support device linking, the normal setup process expected every iPhone to become the registered phone for an account. Entering the same number on a second handset initiated a registration or transfer rather than creating a companion device.
The new release introduces a Link Device option during the initial Signal setup flow. An iPhone can be linked to an account whose primary device is another iPhone or an Android phone. Once pairing is complete, the secondary iPhone uses the same Signal identity and receives conversations associated with that account.
Pairing is authorized through a QR code. The secondary iPhone displays the code, while the registered phone scans it from Signal Settings > Linked Devices > Link New Device. Authentication on the primary phone uses the device passcode or biometrics before Signal opens its pairing camera.
This process is different from transferring a Signal account. A transfer moves the account and its locally stored information to a replacement iPhone, removing that information from the old handset when the process finishes. Linking keeps the primary phone registered and adds another active device.
That distinction is useful when an older iPhone is still being used, when someone carries separate personal and business hardware, or when a travel phone needs access to existing conversations. It can also make a gradual transition between phones less disruptive, although linking should not be confused with converting the secondary handset into a replacement primary device.
Conversation History Can Join the New Device
A newly linked iPhone does not have to begin with an empty conversation list. During setup, Signal allows the user to transfer conversation history from the primary phone or continue without bringing that history across.
When history transfer is selected, Signal can synchronize existing chats and the most recent 45 days of media. The transfer includes more than text. Signal’s linked-device architecture can carry account information, group updates, reactions, quotes, stickers, call events, delivery status, and read receipts where those features are enabled.
The history transfer is designed for initial pairing. If a user chooses not to transfer information and later changes that decision, Signal requires the linked app to be reinstalled so the linking process can be performed again with history transfer selected.
New messages sent or received after pairing appear across the connected devices. The secondary iPhone can therefore be used as an active Signal client rather than as a passive copy of the primary phone’s screen.
The primary phone does not need to maintain a continuous connection for the linked iPhone to receive messages. Signal provisions each device as its own authorized destination, allowing messages to be delivered directly to the devices connected to the account.
There are maintenance limits. The primary phone must come online at least once every 30 days or its linked devices can be disconnected. A linked device is also automatically removed after 45 days of inactivity. If that happens, the registered primary device is required to authorize it again.
One Account, Multiple Encrypted Endpoints
Adding another iPhone does not replace Signal’s end-to-end encryption with conventional cloud synchronization. Signal treats every linked device as a separate encrypted endpoint.
Devices connected to an account share selected identity information, but each device receives its own cryptographic keys for sending and receiving messages. During pairing, the primary phone creates an encrypted provisioning package containing the information the new device needs, along with a one-time authorization token.
The QR code establishes the trusted connection between the two devices. Signal’s servers coordinate delivery, but they do not receive the private keys needed to read the conversation history being transferred or the messages delivered afterward.
This architecture also explains why linking another device is more substantial than signing into a typical web account. Signal is authorizing another physical endpoint to receive encrypted communication under the same identity.
Every linked phone consequently becomes part of the user’s security boundary. Someone with access to an unlocked secondary iPhone may be able to read conversations stored on it, even if the primary device remains protected elsewhere. Device passcodes, Face ID, Signal’s Screen Lock option, and careful control of notification previews remain relevant on every connected handset.
Signal lets users inspect connected hardware from the Linked Devices section on the primary phone. A device that is lost, sold, or no longer needed can be removed remotely from the account’s authorized list. Unlinking prevents it from receiving subsequent messages, although users should still use Apple’s device-management protections when an iPhone is missing.
A Practical Expansion Without Separate Accounts
Multi-phone access does not give Signal native support for multiple independent accounts inside one iPhone app. Both connected iPhones represent the same Signal account, phone number, profile, contacts, and conversation identity.
That makes the feature suitable for one person using several devices, but it does not create a division between personal and professional communication. Someone who needs two distinct Signal identities still needs separate registered numbers and separate account installations on different primary devices.
Signal also limits each account to five linked devices. Those positions may be occupied by iPhones, Android phones or tablets, iPads, and desktop computers. The expansion gives users more freedom to decide how those five positions are used instead of reserving mobile access for a single registered phone.
The release also narrows a convenience gap between Signal and messaging services that have supported multiple phones for some time. Signal’s slower approach has been tied to the complexity of adding devices without treating the company’s servers as a readable central archive.
For iPhone owners, the immediate benefit is straightforward: a spare, work, or travel iPhone can participate in the same private conversations without deactivating the main phone. Both devices remain individually authorized, and either can be removed without changing the account’s phone number.
Signal 8.22 is available through the App Store. The registered phone remains identified as the primary device, while every additional iPhone appears in Signal’s device manager as a separately removable linked endpoint.
