SSN When can I apply for SSN after H1B approval ( COS) from F2
You must wait until the "valid from" date on your H-1B approval notice to apply for your Social Security Number.
You can cross the worry about a mandatory SAVE waiting period off your list. The 15-day delay applies to border entries, not your Change of Status.
You can apply for your Social Security Number on or after the "valid from" date on your Form I-797 Approval Notice.
The documents do not specify a required number of days you must wait for SAVE database synchronization after a USCIS Change of Status approval. While some sources recommend waiting 15 days, this applies to people entering the United States from abroad, because port of entry records take time to update. Since you changed your status inside the country, this border delay does not apply to you.
