U.S. time March 9, Google's Android team released a new Android 5.1 system update through its official blog, adding multiple SIM cards to native Android systems and bringing more sophisticated device protection and high-definition voice calls.
In addition to some stability improvements and performance enhancements, one of the main updates to Android 5.1 is the addition of a more advanced device protection mechanism, where lost or stolen Android devices can remain locked until the original user logs on to the Google account to unlock it, It also maintains the lock status after the Android device has been maliciously restored to the factory setting.
In addition, Android 5.1 provides support for high-definition voice calls, and if your device (such as Nexus 6) or an operator (such as T or Verizon) can support the technology, you can enjoy a clearer call.
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