In the name of God, the Most Gracious, the Most Merciful. May God bless and grant peace to our Prophet Muhammad. . . You can install any company's SIM card in it and it will work with you at a very high speed, not just a Zain SIM. And it is written Zain only because I bought it from Zain, and the router is considered almost new and works with high efficiency. . . This router is officially unlocked by Zain customer service, and it works excellently with all telecommunication SIM cards, not just Zain SIM cards.