Side buttons can be better designed and placed, because everytime you hold your phone somehow they are pressed - the traditional design needs to be upgraded.
Finger sensor for unlock your phone should also work for locking your phone, better that one sensor for both locking and unlocking your phone -upgrade is needed here as well.
Camera should be integrated into the phone screen and should be on whenever you need to click a shot -upgrade needed, also camera quality needs to be upgraded as it is too low comparing to now arriving with really higher pixels (48/64mps, etc.)
