COS PHONES INC. Hi! My name is Avi Desai, and I am the Sales Director over at COS Phones. Located in Haltom City, TX, we are an industry leader in device order fulfillment and distribution. Here at COS, we specialize in ACP, MVNO and Lifeline programs, offering a wide range of devices, ranging from $20-30 all the way to $100 , depending on what best meets your requirements. COS Phones offers a large spectrum of Locked and Unlocked devices.