The Lumia 550 is a budget-series Windows Phone from Microsoft announced on October 6, 2015. The phone is one of a few new Windows 10 Mobile devices from Microsoft that is part of the Lumia line started under Nokia’s mobile efforts.

During its development, the Lumia 550 (RM-1127) is listed under the internal codename of Saimaa a lake in southeastern Finland. It is understood to be a carry over from the original Nokia portfolio of devices that Microsoft acquired when purchasing Nokia’s mobile division.

The Lumia 550 is considered a displacement device meant to take over the range of 5xx and 6xx series of Lumias. Under Microsoft CEO Satya Nadella, the Lumia line is being pruned down to budget phones, flagship devices and phones for businesses. As a result, the 6xx and 7xx series appear to be phased out for now.

Rumored but yet unconfirmed specifications of the Lumia 550 include:

  • 1.1 GHz Qualcomm Snapdragon 210 quad-core
  • Removable SD
  • 8 GB internal storage
  • 1GB RAM
  • 4.7-inch 720 x 1280 AMOLED display
  • 2100 mAh battery
  • Glossy White or Black polycarbonate
  • On-screen keys
  • Metal around the display
  • LTE
  • Speaker lower left on the rear
  • Rear camera with flash

Windows Central first broke the news in September 2015 that this Lumia 550 may feature a flash for the front-facing camera. This conclusion was reached after seeing a prototype phone.

The Lumia 550 is set to be available in December for $139.