Neuralink tests iPhone calls with its speech implant

By Inside BCI · Edited by Velco Dar · October 31, 2026

A man in Neuralink’s speech trial and his wife began their relationship over phone calls. During a three-day visit by Neuralink engineers to his home, the couple talked on the phone again, with his side of the call produced by his brain implant.

What Neuralink built

Neuralink published an account on 29 October of a 72-hour hackathon with a participant in VOICE, its early feasibility study of its implant for restoring speech. Its engineers prototyped features at his home and tested each one with him. Neuralink said none of the engineers has an implant, so only participants can judge whether a design works.

The work centred on Bloom, Neuralink’s mobile app for speech, which the company said it has worked on heavily in recent months. The features included:

Phone calls. Bloom was connected to iPhone calling, so the speech the implant produces goes straight into the call. The team also tested an optional greeting telling the other person the call comes from someone using an assistive communication device.
Typing in any app. An iOS keyboard sends dictation from the implant into any app, with a faster way to correct decoding errors.
Fewer buttons. A system detects when the user is trying to speak and starts and stops decoding on its own. Speech decoding previously needed a button press.
Lock screen. Bloom runs as a Live Activity, so speech can start without unlocking the phone.
A Grok agent. The user thinks of saying “Hey Neuralink” followed by a task, and a Grok agent carries it out on the computer.
Feedback for the user. Real-time visualisations show which imagined speaking patterns produce the strongest signals, helping the participant tune the decoder.

Neuralink described the features as prototypes, and said some were refined in the weeks after the visit.

Why it matters

A speech implant only becomes a product when people use it every day, and that depends on software around the decoder: how quickly it starts, how easily mistakes are fixed and whether it works with the phone and apps people already use. The post shows Neuralink building that software for Apple’s iPhone and testing an agent built on Grok, the AI assistant from another Musk company. Neuralink credited Grok Voice for the synthesised voice in a VOICE clip it posted in September.

The post follows Neuralink’s report on 28 October that one participant with ALS reached 75 words per minute with a 5.8 per cent word error rate in their first week. That figure came from a company post and has not been peer-reviewed.

The Austin site

Neuralink is also expanding its campus at 2200 Caldwell Lane in Del Valle, near Austin, Texas. A filing registered with the Texas Department of Licensing and Regulation on 28 October lists a $2.7 million, single-storey, 7,900-square-foot building named the Vivarium Research Facility, with a procedure room, storage, sanitation, enrichment spaces and controlled enclosures. A vivarium is a facility for housing research animals. Construction is scheduled from 2 November 2026 to 3 May 2027. Earlier filings for the same address list a $14.7 million, three-storey building with offices, a machine shop and cleanroom device manufacturing, registered in 2024, and an $8.2 million fit-out of that building’s third floor for office and manufacturing use, registered in February 2026.

Not disclosed

Neuralink has not said which of the features will reach other VOICE participants, when Bloom will be more widely available, how the Grok agent handles users’ data, or which animals the Del Valle vivarium will house or what research it will support.

What to watch

Whether the hackathon features ship to all VOICE participants.

Whether Neuralink publishes measured results for phone calls and dictation in daily use.

Whether Bloom becomes available to people outside the trial.

Whether construction of the Del Valle vivarium finishes by May 2027 as scheduled.

Sources

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news Neuralink VOICE-trial speech-restoration ALS Bloom iPhone Grok software Austin Del-Valle vivarium manufacturing