Build list legend
Available build 
Confirmed build 
Unconfirmed build 
Fake build Existing page
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Non-existent page
Windows Phone 8.1
| Version of Microsoft Windows | |
 | |
 | |
| OS family | Windows NT |
|---|---|
| Version | 6.3 |
| Codename | Windows Phone Blue |
| Architecture | ARM32, x86[a] |
| Release date | 2014-04-14 |
| Support end | 2017-07-11 |
| Based on | |
| Windows 8.1 | |
| Replaces | |
| Windows Phone 8 | |
| Replaced by | |
| Windows 10 Mobile | |
Windows Phone 8.1 (codenamed Windows Phone Blue) is a version of the Windows Phone mobile operating system.
Windows Phone uses a unique versioning and numbering scheme. Due to this, the base build that a build of Windows Phone is based on is stated on its respective page.
List of known builds[edit | edit source]
Available build Confirmed build Unconfirmed build Fake build Developer Preview[edit | edit source]
RTM[edit | edit source]
Update 1[edit | edit source]
Update 2[edit | edit source]
Notes[edit | edit source]
- ↑ Only available through the public Windows Phone 8.1 Software Development Kit release
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