[Q] i don't know network my note is locked to topic

hello guys

i'm in egypt and purchased samsung galaxy note 3 from ebay

the phone should be unlocked .. but when putting my egyption local sim i'm getting message " sim network unlock pin "

the region lock sticker is not on box (removed) by the seller
box sticker say : its international version

sticker under battery say : sm-n900 (UD) .. i don't know what UD mean
box information wrote in Portugal language ! made in Vietnam !

now i don't know if my phone is us or Europe region lock ! if it's international then should it be locked to network or not !

help me please