Black Wireless

sdi is one of the leaders in the prepaid calling industry in united states. sdi is continuously helping families and businesses in communicating overseas. sdi is rapidly increasing its wholesale distribution network across the nation. sdi has expanded its products as the industry revolutionizes. sdi's black011 is an international pinless top up solution which allows the customer to register up to 10 phone numbers, as well as prepaid wireless top up and rtr. sdi has also introduced black wireless, an exclusive prepaid gsm wireless service, which offers an affordable unlimited talk, text and data plan that incorporates its direct dial international calling feature at the best available rates. for over 17 years we have consistently provided reliable, high-quality products, services and excellent customer service.