Loosing contact number after unlock bootloader

unfortunately i unlock my bootloader, after that i gradually loosing my contact number one by one.
my phone is 4/64 variant. i dont know how to relock the bootloader.
plz help me out.
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Comments
u can try these steps
please don't do any experiment
dial #*#4636#*# in ur phone
click on phone information
click on the 3 dots on the top of the page
click on sim address book
It does not work anything sir.