The second public beta of iOS 9.2.1 is available on iPhone, iPad

Just before the Christmas holidays, Apple released the
first public betaof iOS 9.2.1, so that the public can
test during the Christmas holidays, and make returns.

Since last night, Apple has just made the second beta version available
public. It is possible to download it as an OTA update (over the
air) provided that it is part of the test program open to
public :

This is a minor release and likely has fixes and
performance improvements, as iOS 9.2 was a rather
provided.

iOS 9.2.1 should also be the last version of iOS before a possible
Apple event in March, during which the Cupertino company could
announce the new 4-inch iPhone running iOS 9.3.

If you want to test the public beta on your machine,here is
how to proceed. But remember that this is a beta and it may
cause your device to bug in different ways, therefore reserved for machines
whose daily use is non-critical!

Also read about iOS 9:

• Your questions
  the most common on iOS 9… And our answers!
• 20 astuces iOS 9
  practices not to be missed, for iPhone and iPad
• 10
  new iOS 9 features to test as soon as installation is complete on iPhone or
  iPad
• iOS 9 on
  practical: 17 new questions to ask Siri
• In
  practical: 17 settings that appeared with iOS 9 on iPhone and iPad
• In
  practical: 10 new features of the Mail application on iOS 9
• 
  In practice: everything about the new Notes app in iOS 9
• Practical iOS
  9: master the autonomy of the iPhone and iPad
• iOS
  9: everything about the new iCloud Drive app
• THE
  specific new iPad features in iOS 9
• 
  iOS practice: track and control your data consumption on iPhone
  and iPad
• To your
  machines: iOS 9.1 is available on iPhone, iPad
• 
  iOS 9 “Wi-Fi Assistance” function: details on its
  functioning
• 
  New in iOS 9: here's how to create localized reminders with
  Siri
• All the news and new features of iOS 9

Source

Deputy editor-in-chief, also known under the pseudonym Teza. Former video games journalist, who has been immersed in technology and Apple products since his very first iPhone 3GS in 2009. He has since worked for several American tech sites and now for iPhon.fr. Incidentally YouTuber and Apple product specialist on the MobileAddict channel. To contact me: maxime[a]iphon.fr