Update: AT&T said on July 31 that’s it’s officially rolling out Windows Phone 8.1 for the Nokia Lumia 635 and Nokia Lumia 1520. To begin the download, click the Settings Live Tile > then tap Phone Update.
Microsoft’s Windows Phone 8.1 will be released on June 24 according to a Windows Phone support page, although it’s not clear whether carriers will begin pushing their updates on the same day.
Microsoft’s support lifecycle page has been updated with the new information, listing a lifecycle start date of June 24 and a concluding date of July 11, 2017.
“Microsoft will make updates available for the Operating System, including security updates, for a minimum of 36 months after the lifecycle start date,” Microsoft notes. “These updates will be incremental, with each update built on the update that preceded it.”
As Microsoft notes, however, the distribution of the updates may be controlled by the mobile operator or the phone manufacturer from which you purchased your phone. In short: Even if you own a Windows Phone 8 device, you may not receive your system update on June 24. Carriers typically require weeks to months to years—if they push the update at all—to verify a software update for security and compatibility with carrier-published apps.
Microsoft officials did not confirm the upgrade date. “Windows Phone 8.1 will start rolling out to existing Windows Phone 8 users over the coming months,” a Microsoft representative said via email.
If you really can’t wait for Microsoft to release Windows Phone 8.1, you can get it right nowvia a Microsoft “developer” program that anyone can sign up for. The current download is a developer preview version, which doesn’t necessarily mirror the final consumer build. Of course, over time (and possibly even on June 24) Microsoft will upgrade your phone with much the same bits that it sends to developers.
Because of compatibility and possible security issues, upgrading your phone with the developer preview will probably void your warranty. So, if you’re adventuresome (or have a spare Windows Phone 8 phone), playing with the developer build may make sense. But if you really want to play it safe, wait for carrier approval.
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