Global Roaming Distribution, Inc. (GRDB.OB) is the parent company of CelTrek, an international global SIM card company. CelTrek is the first US-based company of its kind that offers one SIM card for use in all seven continents at an extremely competitive price. Its strategic partnerships with more than 350 GSM systems position the company to be the top business roaming solution for corporations and leisure travelers around the globe.