Open "Contacts" app 
:
- tap on 
,
- tap on 
"Suggestions", if needed,
- tap on 
"Clean up duplicates" or "Merge & fix".*
* This option is displayed only in the presence of duplicate contacts.
To merge contacts separately, tap on "Merge" into each duplicate's window or "Merge all" with a tap at the bottom of the screen.
NB: Merging contacts of different accounts is not possible.
HARRY2 - JERRY3 - LENNY5 - POWER U30 - SUNNY3 - SUNNY3 MINI - TOMMY3 - VIEW GO - VIEW LITE - VIEW MAX - VIEW2 - VIEW2 GO - VIEW2 PLUS - VIEW2 PRO - VIEW3 - VIEW3 LITE - VIEW3 PRO - 64+4 - VIEW4 - VIEW4 LITE - VIEW5 - VIEW5 PLUS - Y50 - Y51 - Y60 - Y61 - 16+1 GB - Y80 - Y81 - Y82 - 
