According to an Android Authority APK teardown, the OHealth application version 4.40.7_6a8017d_251002 has revealed code detailing how OnePlus plans to integrate the Apple Watch into its OxygenOS 16 ecosystem, while also uncovering a separate feature for NFC-based cardless entry.

The analysis of the OHealth app update shows OnePlus preparing a full pairing setup for Apple Watch users. This integration is designed to synchronize data types between an Apple wearable and a OnePlus smartphone. Code found within the application references the ability to sync incoming calls, messages, and phone notifications to the watch. This function extends the OnePlus device’s notification system to the Apple Watch, allowing users to view alerts from their phone on the wearable.

The data exchange is designed to be bidirectional. While phone notifications are sent to the watch, health and fitness data synchronize in the reverse direction. Code strings indicate that “Workout records and health data on your watch” will be synced to the OHealth app on the OnePlus phone. This process creates a central hub for health metrics on the OnePlus device, consolidating information generated by the third-party wearable into a single application.

The setup process, as outlined by discovered code strings, guides the user through sequential steps to establish the connection. An initial prompt is titled “Pair Apple Watch.” Following this, the user is instructed to “Install app on Apple Watch.” Instructions found in the code specify searching for and installing the OHealth app from the App Store, a process that can be performed either directly on the watch or via a connected iPhone.

After the companion app is installed on the Apple Watch, the user opens it to display a unique pairing code on the screen. The OHealth app on the OnePlus phone then prompts the user to “Scan code with your phone.” The user utilizes the phone’s camera to scan the code, establishing the connection between the devices. Screenshots located within the application’s files provide visual support for this pairing workflow, showing interface elements for the setup procedure and for the syncing of incoming calls.

Specific code strings found in the APK detail this setup flow:

<string name="pair_iwatch_setup_dialog_title1">Pair Apple Watch</string>
<string name="pair_iwatch_setup_dialog_msg1_2_new">Messages and notifications on your phone will be synced to your watch. Workout records and health data on your watch will also be synced to "%1$s" on your phone.</string>
<string name="pair_iwatch_setup_dialog_msg1_new">Incoming calls, messages, and notifications on your phone will be synced to your watch. Workout records and health data on your watch will also be synced to "%1$s" on your phone.</string>
<string name="pair_iwatch_setup_dialog_title2">Install app on Apple Watch</string>
<string name="pair_iwatch_setup_dialog_msg2">Search for and install "%1$s" from App Store on either your Apple Watch or iPhone.</string>
<string name="pair_iwatch_setup_dialog_scanpair">Scan to pair</string>
<string name="pair_iwatch_setup_dialog_title3">Scan code with your phone</string>
<string name="pair_iwatch_setup_dialog_msg3">Open "%1$s" on your Apple Watch to show the pairing code.</string>

These findings from the APK teardown provide a procedural framework for a feature previously announced for the OxygenOS 16 update. OnePlus had already confirmed that the update would bring Apple Watch connectivity to its ecosystem. The company’s original announcement detailed that users could remotely control the phone’s camera, locate a misplaced phone, and sync health data to the OHealth app. The discovered code and screen assets show the practical methods by which this cross-platform integration is being implemented.

The same OHealth update contains code for a separate feature designated “Cardless entry.” This functionality is designed to let a OnePlus watch act as a digital substitute for a physical NFC access card. Code strings such as “Open doors with a simple touch” describe the intended use case, suggesting the watch could be used for building entry or accessing secure areas in a workplace. This feature appears to be a self-contained system within the OHealth app, unrelated to the Apple Watch integration.

The workflow for the “Cardless entry” feature involves copying NFC data from a physical access card onto the OnePlus wearable. Embedded instructions guide the user to “Hold the card against the NFC detection area on the front of your wearable device.” Further text provides specific directions, including “You can adjust the position, but do not remove the card until the card has been identified” and a prompt to “Stay in OHealth until this is completed.” Screenshots show a setup screen with an option to “Enroll physical cards on your wearable device.” A separate screen, seemingly for a failed attempt, instructs the user to “keep the card on the detection area until your watch vibrates,” which indicates an interactive enrollment process.

The code strings related to this ‘Cardless entry’ feature include the following:

<string name="wallet_card_package_message">Open doors with a simple touch</string>
<string name="wallet_card_type_title">Card type</string>
<string name="wallet_door_card_entering_text_no_leave">Stay in OHealth until this is completed.</string>
<string name="wallet_door_card_identifing_text">Card detection</string>
<string name="wallet_door_card_identify_content">Hold the card against the NFC detection area on the front of your wearable device. You can adjust the position, but do not remove the card until the card has been identified.</string>

Although the code uses the word “wallet,” the feature appears unlinked to Google Wallet, which manages access card functions on Wear OS. This separation indicates OnePlus is developing a proprietary system for secure entry. Such a system would likely be limited to certain NFC card types and compatible only with OnePlus watches. Both the Apple Watch pairing and “Cardless entry” features were found in development-stage code. An APK teardown is a forecast based on in-progress work, and there is no guarantee that these functions will appear in a public release of the software.

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