Until now, mobile operators have allocated a dedicated spectrum to each radio access technology, such as 2G at 900MHz, 3G at 2100MHz and 4G at 2600MHz. With the rise of global mobile data usage and increasing signaling traffic enabled by the emerging IoT (Internet of Things) applications, the need for more spectrum for LTE and beyond resulted in ultra-expensive spectrum auctions all around the globe. Due to the high cost of the spectrum resources, it is inevitable to re-use the existing spectrum more efficiently. P.I. Works works closely with operators to develop a tailored refarming strategy, as each operator has different requirements and embraces a phased approach.