I have just arrived in USA 2 days ago.
I have family-visa F4 category.
I need to know that will I have to apply for SSN
or I will receive my SSN automatically because I requested for SSN when I filled my
If you asked for an SSN on the DS-260 the SSA will automatically mail the card to the address where you'll receive your green card once they are notified that you have entered the US. This reference says you should complain if you don't get the card within 3 weeks.