We strive to offer our customers the best possible quality for the Tehnoetic refurbished phones. We select screen-protected second-hand phones used with care by their previous owners whom we meet personally. We make sure all hardware is working, we replace the batteries, we replace the scratched plastic parts and we test how Replicant performs.
Tehnoetic S2 smartphones are refurbished Samsung Galaxy S2's pre-installed with the 100% free operating system Replicant. We also offer Tehnoetic S3 phones pre-installed with Replicant. Please note that while the main processor is running only free software, the modem processor is running a Samsung nonfree system.
In 2014, Replicant developers have found a modem backdoor in the Android systems of several Replicant-supported devices, including the S2, and have successfully closed it in Replicant. Additionally, the phone has a read-only nonfree boot rom, which loads a nonfree bootloader. The bootloader is not part of the Replicant system, but it is responsible with loading Replicant. We are telling you this so that before buying the product, you are aware there is also nonfree software running on the Tehnoetic S2, which doesn't respect your freedom and it might not respect your privacy either. For now, we can't offer a full stack freedom-respecting smartphone, but we're joining the efforts.
Also, Wi-Fi and Bluetooth don't work. We recommend purchasing the FSF-endorsed Tehnoetic N150 Wi-Fi adapter and use it with an OTG cable for your Tehnoetic S2 phone, because soon it will be supported by default in Replicant. For now, it works when you configure it from the command line - see the tutorial. And a mobile data connection would be useful in areas not covered by Wi-Fi networks. We are working to add support for our Tehnoetic Nano Bluetooth 4.0 adapter too.
For the complete list of hardware components unsupported in the operating system, please refer to the Specification tab.
Replicant is a completely free operating system based on CyanogenMod/Android, following the GNU FSDG and thus endorsed by free software organizations (FSF, FSFE, Ceata, etc). Replicant has its own modem communication layer, nonfree firmware removed, nonfree libraries removed/replaced and nonfree applications replaced by free ones in the F-Droid repository. For you convenience, Replicant recovery image comes pre-flashed on the Tehnoetic S2. This also enables you to easily upgrade to a newer version of Replicant.
Tehonetic donates 10% of the sale profits of this phone to Replicant. We list the donations on the page Tehnoetic donations.
|Hardware support in the operating system|
|Operating system||Replicant 4.2 0004|
|Cameras||Work both back and front for taking photos, but not for recording video|
|Sensors||Work (all of them)|
|Audio||Works (headphones in jack, loudspeaker), except through Bluetooth and USB connections|
|Video||Doesn't work. In video streaming, only sound works|
|2D graphics||Work fast|
|3D graphics||Don't work with free software|
|Wi-Fi||Doesn't work with free software (works with Tehnoetic N150 Wi-Fi adapter - see the tutorial)|
|Bluetooth||Doesn't work with free software|
|GPS||Doesn't work with free software|
|Hardware media codec||Doesn't work with free software|
|Tehnoetic additions to Replicant|
|F-Droid free software apps||SpiritF|
|Dimensions||125.3 x 66.1 x 8.5 mm (4.93 x 2.60 x 0.33 in)|
|Weight||116 g (4.09 oz)|
|SIM||Mini-SIM, GSM only (CDMA is not supported)|
|Display||Super AMOLED Plus, 16M colors, 4.3 inches in size, resolution 480 x 800, multitouch|
|Main Processor||Dual-core 1.2 GHz Cortex-A9|
|Memory||1 GB RAM, 16 GB internal storage, microSD up to 32 GB|
|Camera||Back 8 MP, 3264 x 2448 px, autofocus, LED flash; Front 2 MP|
|Audio||3.5mm TRRS jack|
|Radio||Stereo FM radio|
|Sensors||Accelerometer, gyro, proximity, compass|
|Battery||Li-Ion 1650 mAh battery|