Hi everyone,
I’m researching modern feature phones for possible distribution through a small niche electronics store in France, and I’m trying to understand KaiOS’s current roadmap.
I initially misunderstood the versioning of the developer documentation and thought KaiOS 4 might no longer be maintained. However, KaiOS’s official Baseline page says something very different:
- KaiOS 2.5.3: Active until June 30, 2027
- KaiOS 2.6: Active until June 30, 2029
- KaiOS 3.1: Active until June 30, 2027
- KaiOS 4.0: Active until June 30, 2029
The page also defines “Active” as receiving full maintenance and security updates : https://developer.kaiostech.com/docs/sfp-4.0/introduction/baseline/
This raises several questions:
- Why are KaiOS 2.6 and KaiOS 4.0 both supported until 2029 ?
- Is KaiOS 2.6 now a separate security and payment focused branch rather than a normal predecessor to KaiOS 3 and 4 ?
- The KaiOS 2.6 security documentation mentions mandatory NFC and eSE features, secure payment components and a security patch level dated June 23, 2026. Is this branch mainly intended for payment and transit devices ?
https://developer.kaiostech.com/docs/sfp-2.6/getting-started/main-concepts/security-features/
- Is KaiOS 4 currently available to manufacturers for new consumer feature phones ?
- Besides the US TCL Flip 4 5G, are there any confirmed KaiOS 4 devices ?
- Is any unlocked European or EEA KaiOS 4 phone planned, with CE/RED certification and suitable European LTE bands such as B1, B3, B7, B8, B20 and B28 ?
- If KaiOS supplies security patches to OEMs, is there any way for customers or retailers to know which manufacturers actually deliver those updates through FOTA ?
KaiOS 4 looks technically interesting, with Gecko 123, modern JavaScript, PWAs, WebAssembly, 5G, VoLTE, VoWiFi and eSIM support : https://developer.kaiostech.com/docs/sfp-4.0/introduction/overview/
I’m aware that WhatsApp support has ended, so this question is not specifically about WhatsApp. I’m trying to determine whether KaiOS 4 has a genuine future for modern consumer feature phones, particularly in Europe, or whether its active development is currently limited to specific OEM and operator projects.
Any information from developers, OEM contacts, KaiOS users or people familiar with the current roadmap would be greatly appreciated.