GPRS, EDGE and HSCSD are in fact only a major leap towards a larger upgrade to the 3rd generation mobile networks of tomorrow, also known as UMTS and IMT-2000. This chapter will first provide information what a 3rd generation mobile network actually is. What are the features of 3G and why are there different acronyms for 3rd generation mobile networks ? What are the frequencies that 3G will use ? The chapter is concluded by a consideration of UMTS and cdma2000 and by a consideration of the migration path from GSM to UMTS.