Change log 2.4.20:
[System]
Optimise the global action bar height
Optimise Google apps, remove from system partition and allow for download from SuperMarket
Optimisation to increase the long-press close application key triggering time (0.5 to 1.5 seconds)
Fix Instagram incompatibility issues
Fix problem connecting USB - dialogue box becomes frozen on screen to select yes / no mount storage
Fix UCAM not compatible
[Phone]
New Desktop phone icon to support display of missed call number
Significantly improve telephone efficiency, including open speed, search efficiency and sliding fluency
Optimise the display of the time field
Fix ending call still shows the green 'return to call' bar
Fix international number does not show the attribution or contact detail properly
Fix in some cases the call operator under the phone does not display the operators name (Developer Edition only)
Fix some SIM/RUIM cards cannot switch APNs
Fix buffer overflow problems with Call log time causing Android Core FC
[Contacts]
Optimise repeat number of details rules e.g. (IP prefix with and without number shown)
Fix problem entering numbers containing ','s leads to FC
Fix contact selector name, number of repeated questions
Fix problem with group pictures
[Messaging]
New single touch access to send group SMS messages
Add new v4 SMS Interface
Optimise fluency of the message lists when sliding
Optimise the choice of regular text messaging time
New support to save MMS attachment to SD card
Optimisation of the new message pop-up window, touch screen area does not close the window
Send contact vCard information is fixed
Fix sending group SMS does not show sending progress
Fix problems with access control, lock screen does not show the MMS preview
Fix problems when restoring where duplication occurs
Fix too many recipients draft saved SMS responses
Removing SIM card does not display the "Save to SIM" card menu item
Optimised efficiency when adding a large number of contacts to a message
Session and list pages often do not display the time correctly for message details
Fix problem with scheduled SMS cannot modify send time
[Themes]
Optimise theme loading resource efficiency
Fix problem where wallpaper cannot be backed up
Fix problem in local theme details page, select local theme without "other@ modules
Fix details page, clicking the menu button causes the screen to go black
Fix application theme, lock screen style
Fix Customised theme does not support module
[Camera]
Fix some third-party cameras cannot record video in non-automatic scene mode
[Gallery]
Optimise default load does not automatically generate album information
Optimisation of automatically generated album information algorithm
Fix some problems with hidden albums
Fix vibration issues (tactile feedback) when in multiple choice editor mode
Fix problem setting show hidden albums, the number of albums total displays errors
Optimise the Album page to speed up photo details page and animation effects
Fix USB hotplug frequently may lead to accidental deletion of files and other data
Fix problem with list of pictures created by third-party applications in the last row are blocked from view
Fix image details page to view a thumbnail (View is fuzzy)
Fix problem deleting albums / pictures
[Music]
Optimisation of single mode, support background playing of music
[Settings]
Optimise near-by Wi-Fi network interface
Remove using SIM card, Setting 3G only operator option
[File Explorer]
Fix in some cases interface problems
[FM]
Fix loading for first time, opening sound options will appear with white bars problem
[Backup]
More secure and efficient mechanism for backup and recovery
Fix problem restoring SMS messages gives duplicated information
[Alarm Clock]
Optimise the Alarm clock settings
Fix some third-party clock applications will clear the icon in the upper right corner of the screen to display activated alarm state