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Spectrum harmonization refers to the uniform allocation of radio frequency bands across an entire region. This is not based on countries because radio waves do not stop at country boundaries and the fact that the world is considered as a global village. Spectrum harmonization reduces radio interference along borders and helps in international roaming and interoperability, thus reducing the prices of telecommunication equipment on a global level.
Spectrum harmonization is a global effort initiated by the International Telecommunication Union (ITU) aimed at improving global roaming and communication across the world. It helps bring people closer together and mobile prices to an economic scale. When regulators make their mobile-sector spectrum even with international band plans, cellular mobile phones can be manufactured cheaply because a single model can be fit for use in many countries within a region of the same band. This will lower the cost of production owing to the economy of scale. Hence more devices are available to people that allow them to connect even if they travel abroad.