STK will likely be a new name to many people, but the UK company has a range of handsets in its portfolio. The X2 is STK's flagship, although it costs just £169.99 (or £179.99 if you opt for the tempered glass variant or want a bundled 32GB MicroSD card). The company's entry-level smartphone is the Evo, which currently costs £39.99, and you can get an STK feature phone for as little as £12.99.
STK X2 review at ZDNet.com