: A unique feature of DCT-4 is that it is its own inverse (involutory) when scaled properly, meaning the same algorithm can both compress and decompress data.
: The architecture is built around two primary Application-Specific Integrated Circuits (ASICs): the UEM (Universal Energy Management) for power and audio, and the UPP (Universal Phone Processor). : A unique feature of DCT-4 is that
However, there was a problem. At the time, mobile carriers (like AT&T, Vodafone, or T-Mobile) "locked" phones to their networks. If you bought a Nokia from Vodafone, you couldn't put a T-Mobile SIM card in it. It would reject the card. If you traveled to another country, you couldn't use a local SIM; you had to pay roaming fees. You didn't truly own your phone—you were renting it from the carrier. At the time, mobile carriers (like AT&T, Vodafone,