So to answer ur question they usually put in 1111 as last 4 or maybe even 1141. If not then have him go into store with foto id like a passport idk wat country they r from but an international passport will work or foreign id he can then set a password that they will ask him for instead of last for bit u can also double check to c wat the last 4 are. AT&T approves ppl without socials so its not a big deal they usually have deposits but its not required to have ss# or be citizen to get a cell. Try it good luck!
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