You don't know differents unbranded and branded software.
Unbranded haven't answer and end call buttons !!!
Only branded have answer and end call buttons!


Unbranded have:
internet button
Activity menu button

Branded have:
Answer call
End call




If you will back to Vodafone software must use these files:

K770_R8BC004_MAIN_VODAFONE_VI_RED53
K770_R8BC004_FS_VFE_LIVE_2_RED53
K770i_1205-3162_R2A_Vodafone_United_Kingdom