Software updates are a long process, which require a partnership between Google, the device manufacturer, and T-Mobile. This is the case for all wireless providers, such as Verizon and AT&T. T-Mobile is a leading wireless carrier in releasing software updates.
After Google develops the initial software, the device manufacturer works with Google and T-Mobile to customize the software for the specific device. The software must be developed to support your device hardware, software overlays like HTC Sense or Samsung TouchWiz, the T-Mobile HSPA+ wireless radio, and preloaded apps and services like Visual Voicemail and Wi-Fi Calling. T-Mobile also works ensure the update has fixes for software issues.
Once the manufacturer creates a release candidate, then T-Mobile tests it for a short time to determine that it works as expected on our network and services. If it does not, the software goes back to the manufacturer to be fixed. The last thing T-Mobile wants to do is release a software that breaks part of your phone.
If the release candidate passes the tests, then T-Mobile determines a release schedule. Until the update passes the tests, there is no guarantee it will be released and there are no release dates to share with you.
T-Mobile understands that some of our customers are very eager to get new software, but we also do not want to release a software version where features are broken or not up to our standards. Please be patient for the update to be developed and stable for your device, before we can release confirmation and dates for a software update.
Check for information about upcoming software updates in the Software Update document in the space for the device.
Contacting T-Mobile or the manufacturer will not provide any information that is not in the Software Update document in the device space. Customer service has the same information that you do.
T-Mobile also recommends that you do not root your phone or install updated software on your own. Installing any Android software on your device that does not come directly from T-Mobile will (1) void your warranty and (2) prevent you from receiving future software updates from T-Mobile.
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