UMTS stands for Universal Mobile Telecommunications System, developed based on 3GPP standards. Its network composed of three main parts UE (User Equipment), Radio Access Network (RAN) and Core Network. … Difference between UMTS and GSM : S.No.UMTSGSM1.UMTS is already 3G.GSM is 2G and 2.5G.2.It is mainly CDMA-based.It is typically based on TDMA .Difference between UMTS and GSM – GeeksforGeeks www.geeksforgeeks.org › difference-between-umts-and-gsm