Tesla Update 2024.2.3 Is Improving Phone Keys By Adding Ultra-Wideband Support

Tesla is improving its phone key with ultra-wideband support

Maxim

In Tesla update 2024.2.3, Tesla is rolling out support for ultra-wideband, a wireless protocol that will drastically improve how Tesla phone keys work.

Ultra-wideband (UWB) requires hardware support on the user's phone and the vehicle, so only some of the most recent models will be supported.

What is Ultra-Wide

Ultra-wideband is similar to Bluetooth in that it uses short-range radio waves to enable devices to communicate, although it’s a separate protocol all together. It uses less energy than Bluetooth while providing high-precision location tracking beyond what can be achieved with Bluetooth. The technology is often used to accurately locate devices and determine the precise distance between multiple UWB devices.

Improved Phone Keys

Tesla phone keys are fantastic and give you a way to lock and unlock your vehicle without having to carry a key. They also let you share temporary or permanent keys with others without ever having to hand something over physically. It's one of the ways Tesla can now offer self-serve demo drives without any staff on hand.

While phone keys are great and work reliably most of the time, occasionally the car doesn't recognize that the phone is nearby, requiring you to take out your phone and unlock it or even open the Tesla app before it recognizes that the phone is nearby.

The addition of support for ultra-wideband should solve these issues almost completely by precisely knowing where the phone is in relation to the vehicle. UWB support is also expected to improve other features that rely on knowing your phone’s location, such as selecting the correct driver profile depending on which phone key is closest to the driver’s side.

Enabling UWB Phone Key

The new phone key won’t work out of the box. To use the improved UWB phone key, you’ll need to set it up in the Tesla app. The app will prompt you to “Upgrade Your Phone Key,” and you’ll then need to grant the app access to UWB, which the iPhones call Nearby Interactions. You can remove or check on whether the app has access at any time by navigating to iPhone Settings > Privacy & Security > Nearby Interactions.

Release Notes

Tesla states that its new feature "Ultra-Wideband Phone Key" will improve your phone key due to greater accuracy and better responsibleness.

The release notes read:

"Ultrawide band (UWB) technology is now available for Phone Key. So your vehicle and Phone Key can communicate with greater accuracy to more responsively lock, unlock, and open Automatic Doors.”

“In the Tesla app, choose Phone Key > Upgrade and follow the instructions. After setup, keep your iPhone Settings for Nearby Interactions on for Tesla. Requires iPhone 11+ and Tesla app 4.29.5+."

Cars Supported

Since ultra-wideband requires specific hardware, it can’t be added in a software update unless the hardware is already in the vehicle. Only some of the latest Tesla vehicles appear to support the new wireless protocol.

We have confirmed that the new Model 3 is supported, as well as the 2023 Model X. All refreshed Model S and Model X vehicles include the new UWB frequencies in the certificate of conformity and are likely to receive this feature, but it doesn’t appear to be going out to all new S/X models yet. The Cybertruck is expected to be supported as well.

The first-gen Model 3 and current Model Y unfortunately do not have UWB support.

Phones Support

In addition to the vehicle having support for UWB, the phone must also support it. All models since the iPhone 11 have included support for ultra-wideband. This spans across all models and sizes.

While some Android phones also include UWB hardware, Tesla is launching support for the iPhone first, but we can expect supported Android phones running Android 13 or later to be added at some point in the future as well.

On the Android side, the Pixel 6 and above have support for UWB on the Pro models, while the Galaxy S series phones support the protocol since the S21, but only on the Plus and Ultra models. The Galaxy Z Fold 2 and above also include support as well as other flagship Android phones.

Tesla App Support

Tesla started adding support for ultra-wideband back in July 2023 when Tesla updated their app to v4.23.5 and included references to ultra-wideband. Tesla says that you’ll require the latest Tesla app, v4.29.5 or higher to use the new feature.

Ultra wide-band will bring greater accuracy and reliability to Tesla's phone keys. The phone key is already great and the only thing holding it back is its ability to work reliably 100% of the time, but it looks like that is about to be fixed if you own a new Tesla model.

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Musk Teases Major Improvements to FSD — Is Version 14 on the Way?

Not a Tesla App

Following a period of radio silence from Tesla on FSD updates, Elon Musk has finally hinted that progress is continuing behind the scenes on FSD and that “Several major improvements are incoming.” We’re pretty excited - it has been over 100 days since the last FSD update, and we haven’t heard much since then.

And several major improvements are coming

— Elon Musk (@elonmusk) May 1, 2025

The latest versions of FSD were V13.2.8 for AI4 vehicles and V12.6.2 for HW3 vehicles, both of which were released in January of this year — almost four months ago. While development has been ongoing internally, many have been wondering what the next public release will be. Will it be FSD V13.3, or will we jump straight to FSD V14.

Decoupled Releases & Spring Update

Tesla has now begun pushing Early Access users the 2025 Spring Update without an FSD version change. This means that we can expect the next FSD update to likely be based on the 2025.14 branch.

It’s worth noting that Tesla can add improvements to FSD at any time - and sometimes they do make minor changes without incrementing release numbers - small flag changes in FSD’s software to address how it does a specific task, or what data is uploaded.

With all that said, we expect the Spring Update to begin going out to more of the fleet in the coming days. We’re currently seeing about 58% of the fleet on the Spring Update, and only 30% of the fleet on the older 2025.8 January Update.

Cybertruck FSD

Not A Tesla App received information that an upcoming update was set to bring features from other AI4 vehicles to the Cybertruck, including Start FSD from Park, Unpark, Actually Smart Summon, and more. This update was intended to bring it closer to feature parity with the rest of Tesla’s AI4 fleet, but for now, Cybertruck remains the redheaded stepchild of the fleet.

We’re still confident that Tesla is working on this, and the continued delays on the release of an FSD update could point to the Cybertruck and a lack of data continuing to be a pain point for Tesla’s AI team. Cybertruck owners, including the author, have noted that FSD-equipped Cybertrucks continue to upload several hundred gigabytes or more of data per month. This topped out at nearly 1.9 TB of data uploaded in April 2025 for the author.

That’s a massive amount of data - and other users on social media have mentioned much the same for their own Cybertrucks. Tesla needs as much data as possible to tune the FSD models, and given the small fleet size for the Cybertruck, it requires a vast amount of data per user.

“Major Improvements”

While Elon didn’t mention what constitutes these major improvements, we have a lot of expectations besides what we know about the Cybertruck. Learning from the recent and successful FSD launch in China, Tesla is now able to utilize a more generalized model without specific local training data. This could potentially translate into better performance in North America as well, as the 7.7 million miles globally driven on FSD every day are feeding back into Tesla’s data loop.

We’re hopeful that future improvements continue to focus on improving tracking and decision-making, as well as lane handling. FSD users on X continue to point out issues with lane selection and lane keeping in the latest versions of FSD. On the flipside, Tesla has greatly increased the comfort and smoothness of FSD - and V13 is a prime example of that.

While V13.2.8  is also capable of pulling into parking stalls both forwards and in reverse (thanks to one of those flag changes recently), it does an oddly poor job of parking. Tesla’s Vision Autopark, on the other hand, is exceptionally accurate, even with big vehicles like the Cybertruck. It feels like Tesla is working on the parking lot stack to prepare for the upcoming launch of Robotaxi in June.

What About FSD V14

Back in the Q4 2024 Earnings Call, we heard about FSD V14, and just learned a little bit of what will make it unique. In this case, it's auto-regressive transformers that will improve FSD’s already powerful perception system and help it to predict better how other vehicles and road users will behave around it.

That, alongside a larger model and increased context size, will help FSD manage edge cases and make better decisions. The larger model and context size increases are likely another challenge for Tesla, which is already pushing the hardware limits of AI4 with FSD V13.

We did a deep dive into what we know about V14, which you can read here.

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Tesla Introduces Acceleration Boost for Refreshed Model Y

@MatthewDR on X

The non-Launch Edition version of the refreshed Model Y began shipping just a few weeks ago. One of the few things you couldn’t get that the Launch Edition came with was the Acceleration Boost. Tesla wasted no time with this vehicle and is now offering Long Range AWD owners the option to purchase Acceleration Boost.

Tesla didn’t offer a Launch Edition version of the new Model 3 when it launched in 2024. While Acceleration Boost is now available for the new Model 3, it remains restricted to the Asian-Pacific market. It’s not clear why it’s not available in other regions, but it’s possible it could be due to battery chemistries.

Boost Now

Acceleration Boost is an option that has generally been offered for most Model 3 and Model Y Long Range Dual Motor variants, providing excellent performance for the price. A vehicle with Acceleration Boost places the vehicle somewhere between the regular Long Range variant and the Performance version.

In the Refreshed Model Y’s case, Acceleration Boost cuts the official 0-60 mph (0-100 km/h) time from 4.6 seconds down to 4.2 seconds, adding a hefty boost. This is achieved by unlocking approximately 100 additional horsepower from the drivetrain through software.

That 4.2-second time is also 0.1 seconds faster than the rated 0-60 on the original Model Y with Acceleration Boost, so it’s another generational improvement right there.

Cost & Availability

Acceleration Boost is priced at the standard $2,000 USD - and will eventually become available in most global markets for that equivalent price. The upgrade is available now in the United States and Canada ($2,700 CAD), and should hopefully be available globally within the next few days.

Owners can purchase Acceleration Boost through the Tesla mobile app from Upgrades > Software Upgrades > Acceleration Boost, or through the vehicle touchscreen from Controls > Upgrades, provided that In-Car Upgrades are enabled (set in the Tesla App).

The vehicle will need a network connection to process the configuration update, which only takes a few minutes. During the configuration update procedure, the vehicle will not be drivable and will reboot.

Eligibility

It is important to note that the Long Range Rear-Wheel Drive (RWD) variant, which is available in Europe and Asia-Pacific, is not eligible for this upgrade as it lacks the necessary dual-motor configuration.

Owners of the Launch Edition already have this feature by default and won’t need to purchase it.

No Track Mode

If you’re hungering for Track Mode and all the functionality it offers, we recommend waiting for Tesla to release the Performance variant of the Refreshed Model Y. While Elon did mention in the past that Acceleration Boost would grant access to Track Mode, it hasn’t happened quite yet.

Is It Worth It?

Acceleration Boost helps to bridge the gap between the Performance variant and the Long Range AWD variant, offering quicker acceleration without the need to opt for the dedicated and more expensive Performance variant.

This is especially so today, where the Refreshed Model Y Performance hasn’t been announced yet - so if you’ve already purchased a Long Range AWD and want to go just a bit faster, this is a fantastic option at a good value.

The difference in acceleration is noticeably faster, just like Acceleration Boost with the original Model Y. If you really want to take off a little faster or want to take the vehicle to the track, this will definitely be a worthwhile upgrade.

Tesla hasn’t noted a reduced range with this upgrade, similar to the refreshed Model 3’s Acceleration Boost. Older models had about a 5% range loss due to the additional always-available acceleration and cooling requirements.

This is one of Tesla’s most popular upgrades due to its relatively low cost while also adding some additional value to the vehicle.

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