Mobile Telecommunications System (UMTS) is one of the third-generation (3G) cell phone
technologies, which is also being developed into a 4G technology.
card adapter helps to use 2 sim cards in one phone. Yes I am using a card
called Hypercard 3G and it really works with UMTS. I got it from http://www.2-phones-in-1.com/ [2-phones-in-1.com]