The bigger addition is Bluetooth access to SMS and iMessage conversations, contacts and app notifications. All of it arrives on a Linux machine with no changes required on the iOS side.
Tether flips the approach. Instead of asking the iPhone to cooperate with a stranger, the Linux machine dresses up as something the iPhone already trusts.
Specifically, the computer emulates a paired Bluetooth accessory. Under the hood, the project relies on several standard Bluetooth profiles. Those are MAP (Message Access Profile), PBAP (Phone Book Access Profile) and ANCS (Apple Notification Center Service).
Each profile handles a different job. One covers messages, one covers your address book, and one pipes through the notifications that light up your lock screen.
Setup, requirements and the November updates
The Linux side runs on BlueZ, the widely used Bluetooth software stack for Linux. Full functionality requires BlueZ version 5.86 or later, with experimental features switched on.
Getting started involves two commands. Users run tether –bt-setup and then tether –bt-pair to link the devices.
The phone still gets a say. After pairing, users must grant iOS permissions for notifications and contacts before the data starts flowing.
Work has continued since the August release. Documentation updates in early November 2026 added improvements to ANCS over BR/EDR, the classic Bluetooth connection mode.
Those revisions also covered dual-bond handling and expanded troubleshooting guidance. As of November 2026, the project’s status points to ongoing refinements aimed at reliability.
What this means for users and developers
The tradeoffs are real, though. Requiring BlueZ 5.86 or later with experimental features enabled means some distributions may need updates before Tether works fully, and experimental code carries the usual stability caveats.
The November focus on dual-bond handling and troubleshooting suggests connection reliability is the main area still under active work.
Privacy-minded users will also want to note the permissions involved. Granting a desktop access to messages, contacts and notifications widens the set of devices holding sensitive personal data.
On naming, the project is separate from the company behind the USDT stablecoin, according to the research on the repository. The shared name is a coincidence, and the project’s purpose is desktop and mobile connectivity.