Just identification. As they announced in one of the meetings. HW limitation of I2C only capable boards still remains.
I’m glad you’ve implemented that readout.
As described in the relevant thread, the restriction won’t be relevant for most applications.
If necessary, it can always be replaced.
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In case you missed it, today’s update states:
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thx, came home late tonight and found your post before the official one… 
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I’m one of the users reporting a discrepancy: my Jolla Phone 2026 is a batch 3 unit, delivered in September 2026, so per Jolla’s official update it should come with the corrected I3C sub-board (“Batch #3 phones have the I2C and I3C capable daughter board”).
However, Settings → About product → Device identifiers shows “TOH interface : I2C” on my device.
Details:
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Serial number: JP260112256004506
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Purchase order: 21314 / purchased April 2026
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Sailfish OS version: 5.2.0.22 (Finlayson)
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Delivered: September 2026, France
Questions:
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Is this readout known to be inaccurate in some cases, or does it reliably reflect the actual sub-board hardware (as stated in this thread, it should be a plain identification)?
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If the unit really has the old I2C-only sub-board, what should I do — request a replacement sub-board via warranty@jolla.com, and is the replacement process from the earlier posts (iFixit guide) applicable?
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good question, could be it is not reliable at this point.
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I3C was not promised when you (and I) ordered the phone. The promise upgrading the phone with TOH and the specification for TOH has come after they sold the first three batches, if I remember correctly. So having I3C is the expectation for the buyers in the later batches, but not for us #1-#3, who even have ordered before TOH was promised.
So my POV is, that I3C is some kind of upgrade to the JP, that later devices get (similar like a facelift a car-model gets usually after a few years). So its not a defect hardware in case of the warranty. If you are a developer of your own TOH, than contact Jolla and you will probably get a I3C-capable board. And if not live with I2C or buy a I3C-board, when it will be available in shop one day.
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Thanks for the answer.
On point 2: Jolla’s own update (link) states: “starting from September all Batch #3 units have been shipped with sub-boards capable to support both I²C and I3C.” My unit is a batch 3 device delivered in September 2026, so per that statement it should have the revised sub-board.
On point 1: that is exactly my question — is the “TOH interface” readout reliable? If it is, my unit appears to carry an old I²C-only sub-board despite being a batch 3 unit; if it is not, it would be good to know (and a software fix would settle it).
@Jolla could you clarify which of the two it is for batch 3 units showing “I2C”? And if the readout is correct, is requesting a sub-board replacement via warranty@jolla.com the right path?
Hah, I thought I was the only one, my Jolla also reports I2C. Serial number 005785.
I dont expect to need I2C anytime soon (or at all, probably) so whatever happens happens, but I’m interested how this fits in with the “Batch 3 has the new board” communication.
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Dis you get the phone early September. I’m just wondering if the phone was prepared already in August and shipped early September
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I received mine on 8 October 2026; per my Jolla order (21314, placed April 2026), it was shipped on 1 October 2026 (visible in my commerce.jolla.com account). Small correction to my earlier posts, which said September — the exact dates are 1 October (shipping) and 8 October (delivery).
That transition-window hypothesis still makes sense — my unit is a batch 3 shipped on 1 October with serial number ending 04506, and another user in this thread (Egocentrix, post 150, serial ending 005785) also sees “I2C” on their batch 3 device, so a batch 3 range shipped with the old sub-board does seem plausible. Hopefully @Jolla can clarify which production/shipping window received the revised I²C+I3C board.
I’m the same. Batch 3 but have an I2C board.
EDIT: Shipped on Sept 22nd and received on October 1st.
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User @Toly has the I3C board on a device received today. Jolla Phone update - Lights on, technical bits and the schedule - #546 by Toly
i got my device in early october and i have I3C too
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As @mettska wrote, ‘‘I3C was not promised when you (and I) ordered the phone. The promise upgrading the phone with TOH and the specification for TOH has come after they sold the first three batches, if I remember correctly. So having I3C is the expectation for the buyers in the later batches, but not for us #1-#3, who even have ordered before TOH was promised.’’
Therefore no warranty applies anyways what so ever.
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Jolla did not promise, but delivered. Great feedback and customer care !! That’s the way to do it !!
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Exactly this. TOH was additional feature Jolla added free of charge.
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I3C was first mentioned on Feb. 19 Jolla Phone update - Lights on, technical bits and the schedule when batch #3 was in the 9000s.
The phones being shipped right now are also from late batch #3 and finally have I3C.
I would say it is very likely that all who have seen “I3C” as specification at the time of pre-order are actually getting a phone with an I3C board.
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This thread surfaced on latest so it sparked my curiosity again.
it’s been almost half a year now since the announcement and about 10 thousand devices in people’s hands.
Is there at least one person capable or planning to make a TOH that demands i3c or not yet?
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Exactly this. I’m still waiting first company (or community) to sell TOHs with added functionalities. A lot of great tinkering in this very community, but I’m waiting the first one who I can throw money at 
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what would you like?
Meshtastic lora?
Huge battery pack with mppt-solar and 100W in/out?
halow wifi?
jolla to breadboard adapter for tinkerers?
wireless charging receiver?
please let me know what you want built 
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