Sigma mobile X-style S3500 sKai 4 GB / 0.5 GB
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Sigma mobile X-style S3500 sKai 4 GB / 0.5 GB
Screen:2.4 ", 320x240, 167 ppi
Memory size:4 GB, + memory card slot, RAM 0.5 GB
Camera:2 MP
CPU:MediaTek MT6572
Battery:2000 mAh, removable
Wi-Fi module. Front-camera. Youtube, Google Maps, WatsApp, Facebook and others. KaiStore for downloading apps and games. 3G support. Built-in FM antenna for listening to the radio without using headphones.
Push-button "mobile phone" with the functionality of a simple smartphone. It is suitable for a child or teenager, as a spare “tube”, or it will fit an unpretentious category of users. The phone is running the KaiOS system, adapted to small screens and push-button control. Out of the box, Youtube, Google Maps, WatsApp and Facebook applications are loaded into the Sigma X-style S3500 sKai (4 GB) memory.
A number of other toys and programs are available in the company's KaiStore app store. The screen of the model is stretched diagonally by 2.4", the picture is displayed on it in a modest resolution of 320x240 pixels. Oddly enough, the "tube" is armed with a 0.3 MP front camera. The photomodule from the rear is shooting at a resolution of 2 MP. The flash next to it acts as a flashlight. From wireless communications, the phone was “brought up” with a 2.4 GHz Wi-Fi adapter and a Bluetooth 4.0 module. Thanks to the built-in antenna on the unit, you can listen to FM radio without using headphones. The handset is powered by a 2000 mAh battery.
All specifications
Specifications X-style S3500 sKai
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The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Sigma mobile 2025 - new arrivals, bestsellers, and the most relevant models Sigma mobile.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog Sigma mobile 2025 - new arrivals, bestsellers, and the most relevant models Sigma mobile.
Series Sigma mobile X-style (feature phones)Compare using chart →
2.4 ", 167 ppi, proprietary, MediaTek MTK6261D, charger: 4050 mAh, removable battery, 163 g
2.4 ", 167 ppi, proprietary, MediaTek MTK6261D, charger: 4050 mAh, removable battery, 138 g
2.8 ", 167 ppi, proprietary, MediaTek MTK6261, camera: 0.3 MP, charger: 3100 mAh, removable battery, 127 g
3.5 ", 165 ppi, proprietary, camera: 0.3 MP, charger: 3400 mAh, removable battery, 146 g
2.4 ", 167 ppi, proprietary, 4 GB, RAM 0.5 GB, MediaTek MT6572, camera: 2 MP, charger: 2000 mAh, removable battery, 108 g
Model overview based on user reviews
The Sigma mobile X-style S3500 sKai is a basic button phone that offers a mix of essential features and limitations. Its customizable menu allows users to tailor the interface to their preferences, and the inclusion of a removable battery and a memory card slot provides convenience and storage expansion options. The phone supports dual SIMs, 3G, Wi-Fi, Bluetooth, GPS, and FM radio, making it versatile in terms of connectivity. However, the device suffers from sluggish performance and a limited WhatsApp functionality, which only supports messaging and audio without video or Wi-Fi calls. Users have reported issues with quick battery drainage and screen flashing after a few weeks of use. The camera quality is also lacking, with a low-resolution sensor and no focus capabilities. Despite these drawbacks, the phone's ability to install apps and games from KaiStore or a PC adds some value for users seeking basic functionality in a non-smartphone device.
Pros
Cons
4 1 3 0 |
The most affordable "non-smart button" on KaiOS in the CEE region. Not a smartphone, not perfect, not fast - BUT not bad as a... "dialer" :-))) "The world didn't even dream of rooting and jailbreaking a "BUTTON" IN 2020" ;-))) * I hope this somehow helps someone :-) + 2 SIM, good signal (with noise reduction), 1000+ contacts, 4 Gb ROM, microSD slot up to 32 Gb + 3G, WI-FI abg (sharing available), Bluetooth 4, GPS, FM (with recording), Player (background), photo 2Mpx, battery 2000 mAh + Google Maps /Duo/Search/YT, E-mail, FB, Twitter, WhatsApp (text), Telegram (with challenges), Uber (mobile site) + Install Apps and Games (easy variety from "store" or challenging useful ones from PC), eReader, Weather, Voice Recorder - Primitive design, small screen, weak MTK processor and flashlight, 512 Mb RAM, inaccurate GPS, SLOW OS interface - Very "limited" functionality for file manager, browser, applications, NO Viber, Instagram and many other useful and familiar apps - Significant heating, unstable transfer speed and fast battery drain in "WI-FI hotspot" mode - Ads and tracking in many applications, weak data protection, voice control via GA in English use Sigma mobile X-style S3500 sKai few months |
Setting up this model takes an eternity and a lot of patience. The manual is printed in such tiny letters you practically need a microscope to read it. It doesn’t cover many things, and some are only explained superficially. Some menu items might take forever to locate — it’s quite poorly designed. You end up pressing the wrong buttons, especially the central ones, making you want to use a needle to press them. The microUSB cord started acting up on the second day despite careful and proper handling. Updating the software requires taking out the memory card and switching to Russian. Viber still cannot be installed. The strap holes are placed at the top (instead of the corners), making it incredibly difficult to thread it through. The assistant is in English, so you begin to wonder: what's the point? Bluetooth and WhatsApp took two days to set up. WhatsApp has very basic functionality. Through Bluetooth, you can only access the memory card folders; there’s no access to the internal memory folders via Bluetooth, yet on the computer, it shows as a smartphone. The downloaded wallpaper photos are inconvenient, making it hard to see the date, time, and other icons. Although this isn’t a big issue, you can download suitable ones. There is a color inverter in the settings, but it makes things worse. There is a font enlargement function, though even without it, some menu items show only a few initial letters. The smut menu can be customized by looking at the icons or the list. Maizhe described everything in the comments. It is even more important to inculcate the knowledge of these people, but for others it may not be possible.  Oleksіy: use Sigma mobile X-style S3500 sKai less than month |
The model is good, but the screen flashes for 3-4 weeks of use. Everything else Screen flashing use Sigma mobile X-style S3500 sKai less than month |
3 out of 8 user review(s) shown
5 more user review(s)
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good sound, 5G, 6.7 ", AMOLED (LTPO), 509 ppi, 120 Hz, LTPO, Android 14, 256 GB, UFS 4.0, RAM 12 GB, LPDDR5X, powerful processor, Exynos 2400, camera: 3 modules, 50 MP, + 10 MP, + 12 MP, съемка 4K, stabilization, slow motion, Wi-Fi 6E, no microSD, NFC, stereo speakers, protection IP68, no 3.5 mm, charger: wireless, fast charge, bypass charge, 4900 mAh, 196 g, no charger
5G, waterfall screen, 6.7 ", OLED (polymer), 393 ppi, 144 Hz, Android 14, 256 GB, UFS 2.2, RAM 8 GB, LPDDR4X, Snapdragon 7s Gen 2, camera: 2 modules, 50 MP, + 13 MP, съемка 4K, stabilization, slow motion, Wi-Fi v5, no microSD, NFC, stereo speakers, Dolby Atmos, Hi-Res, protection IP68, no 3.5 mm, charger: fast charge, 5000 mAh, 175 g
flagship smartphones, camera phone, 5G, 6.9 ", AMOLED (LTPO), 496 ppi, 120 Hz, LTPO, Android 15, 512 GB, UFS 4.0, RAM 12 GB, LPDDR5X, powerful processor, Snapdragon 8 Elite, camera: 4 modules, 200 MP, + 10 MP, + 50 MP, съемка 4K, stabilization, slow motion, Wi-Fi 7, no microSD, NFC, stereo speakers, Dolby Atmos, Hi-Res, protection IP68, no 3.5 mm, charger: wireless, fast charge, bypass charge, 5000 mAh, 218 g, no charger
5G, 6.67 ", AMOLED, 446 ppi, 120 Hz, Dolby Vision, Android 15, 256 GB, UFS 4.0, RAM 8 GB, LPDDR5X, powerful processor, Dimensity 8400-Ultra, camera: 2 modules, 50 MP, + 8 MP, съемка 4K, stabilization, slow motion, Wi-Fi v6, no microSD, NFC, stereo speakers, Dolby Atmos, Hi-Res, protection IP68, no 3.5 mm, charger: fast charge, 6000 mAh, 195 g, no charger
5G, 6.7 ", Super AMOLED, 385 ppi, 120 Hz, Android 15, 256 GB, UFS 3.1, RAM 8 GB, LPDDR4X, Exynos 1580, camera: 3 modules, 50 MP, + 12 MP, съемка 4K, stabilization, slow motion, Wi-Fi v6, no microSD, NFC, stereo speakers, protection IP67, no 3.5 mm, charger: fast charge, 5000 mAh, 198 g, no charger
camera phone, 5G, 6.67 ", AMOLED, 446 ppi, 144 Hz, Dolby Vision, Android 14, 512 GB, UFS 4.0, RAM 12 GB, LPDDR5X, powerful processor, Dimensity 9300+, camera: 3 modules, 50 MP, + 50 MP, + 12 MP, съемка 4K, stabilization, slow motion, Wi-Fi 7, no microSD, NFC, stereo speakers, Dolby Atmos, Hi-Res, protection IP68, no 3.5 mm, charger: wireless, fast charge, 5000 mAh, 209 g, no charger
for military, 5G, 6.4 ", AMOLED (LTPO), 459 ppi, 120 Hz, LTPO, Android 14, 256 GB, UFS 2.2, RAM 8 GB, LPDDR4X, Dimensity 7300, camera: 3 modules, 50 MP, + 10 MP, + 13 MP, съемка 4K, stabilization, slow motion, Wi-Fi 6E, no microSD, NFC, stereo speakers, Dolby Atmos, protection IP68, impact resistant, no 3.5 mm, charger: wireless, fast charge, 4310 mAh, 171 g, no charger
waterfall screen, 6.67 ", AMOLED, 395 ppi, 120 Hz, Android 14, 256 GB, UFS 2.2, RAM 8 GB, LPDDR4X, Helio G100-Ultra, camera: 3 modules, 200 MP, + 8 MP, stabilization, Wi-Fi v5, NFC, stereo speakers, Dolby Atmos, protection IP64, charger: fast charge, 5500 mAh, 180 g, no charger
5G, 6.72 ", IPS, 392 ppi, 120 Hz, Android 13, 256 GB, UFS 3.1, RAM 8 GB, LPDDR4X, Unisoc T820, camera: 2 modules, 50 MP, Wi-Fi v5, no microSD, NFC, stereo speakers, DTS, no 3.5 mm, charger: fast charge, 6000 mAh, 208 g
for military, 5G, waterfall screen, 6.7 ", OLED, 444 ppi, 120 Hz, Android 15, 512 GB, UFS 4.0, RAM 12 GB, LPDDR5X, powerful processor, Dimensity 8350 Extreme, camera: 3 modules, 50 MP, + 10 MP, + 50 MP, съемка 4K, stabilization, slow motion, Wi-Fi v6, no microSD, NFC, stereo speakers, Dolby Atmos, protection IP68/IP69K, impact resistant, no 3.5 mm, charger: wireless, fast charge, 6000 mAh, 186 g
5G, 6.7 ", AMOLED (LTPO), 513 ppi, 120 Hz, LTPO, Android 15, 256 GB, UFS 4.0, RAM 12 GB, LPDDR5X, powerful processor, Snapdragon 8 Elite, camera: 3 modules, 50 MP, + 10 MP, + 12 MP, съемка 4K, stabilization, slow motion, Wi-Fi 7, no microSD, NFC, stereo speakers, Dolby Atmos, Hi-Res, protection IP68, no 3.5 mm, charger: wireless, fast charge, bypass charge, 4900 mAh, 190 g, no charger
5G, 6.7 ", Dynamic AMOLED, 385 ppi, 120 Hz, Android 14, 256 GB, RAM 8 GB, powerful processor, Exynos 2400e, camera: 3 modules, 50 MP, + 8 MP, + 12 MP, съемка 4K, stabilization, slow motion, Wi-Fi v6, no microSD, NFC, stereo speakers, protection IP68, no 3.5 mm, charger: wireless, fast charge, 4700 mAh, 213 g