Today at Mobile World Congress 2015, Microsoft introduced Lumia 640 and Lumia 640 XL, two new smartphones. Both phones are upgradeable to Windows 10 and offer a choice of screen sizes and camera capabilities, along with Microsoft services.

The phones pack 1 GB of memory onboard and Qualcomm Snapdragon processors featuring quad-core CPUs running at 1.2GHz. They have 5 inches and 5.7-inches high-definition (HD) displays (Lumia 640 and Lumia 640 XL, respectively), along with long-lasting batteries - 2500 mAh for Lumia 640 and 3000 mAh for Lumia 640 XL.

Users can capture photos even in low light with the 8MP camera on Lumia 640 or 13MP ZEISS optics on Lumia 640 XL. Both feature LED flash, a front-facing camera for Skype video calling, and Lumia Camera software right out of the box.

The phones run the latest version of Windows Phone 8.1 and the Lumia Denim update, complete with one-swipe Action Center, Word Flow and Live Folders. People can also upgrade Lumia 640 and 640 XL to Windows 10 when it becomes available later this year.

The devices support LTE connectivity, including the dual-SIM models. In addition, all dual-SIM models will feature Smart Dual SIM to help ensure users never miss a call.

Lumia 640 and Lumia 640 XL owners will be able to access new Windows 10 features through the Windows Insider Program, as well as upgrade to Windows 10 later this year. Key features and improvements of Windows 10 include new universal apps such as Office, Mail and Calendar, and Photos; Internet Protocol-based messaging from Skype and others integrated directly into the messaging experience; an entirely new browsing experience with the new Project Spartan browser; and extended integration of the Cortana personal assistant.

Lumia 640 and Lumia 640 XL also come with a one-year subscription to Office 365 Personal, which includes the latest Office applications (Word, Excel, PowerPoint, Outlook and OneNote) on the Lumia as well as on one PC or Mac and one tablet, plus 1TB of OneDrive storage, and 60 free minutes of Skype Unlimited Worldwide calling per month.

Lumia 640 XL will begin rolling out globally in March and will be available in matte cyan, orange and black, as well as both matte and glossy white. Lumia 640 will be available starting in April and will be available in glossy cyan, orange and white, as well as matte black.

Both Lumia 640 and Lumia 640 XL will be available in single-SIM and dual-SIM LTE and dual-SIM 3G variants. Lumia 640 XL will also be available as a single-SIM 3G variant.

Lumia 640 is estimated to be around 139 euros for the 3G model and 159 euros for the LTE model, before taxes and subsidies. Lumia 640 XL will be around 189 euros for 3G and 219 euros for LTE, before taxes and subsidies.

Partnership with AT&T

Microsoft also announced at the Mobile World Conference in Barcelona
a partnership with AT&T on the AT&T Mobile Office Suite: a cloud-based, mobile collaboration solution for small-to-medium sized business (SME) customers, exclusively from AT&T and Microsoft in the US.

Fully integrated and with predictable monthly costs, the AT&T Mobile Office Suite offers access to voice calls, email, calendars, instant messaging, HD video conferencing, desktop sharing, file sharing, and more.