A fun graphic to see how the radio frequency has been divided in the United States.
A few relevant frequencies (from Wikipedia):
• 4g (cell) - 700 MHz | 750 MHz | 800 MHz | 850 MHz | 1700 MHz | 2100 MHz | 1900 MHz | 2500 MHz
• 3g (cell) - 850 MHz | 1700 MHz | 2100 MHz | 1900 MHz
• 802.11a (WiFi) - 5 GHz | 3.7 GHz
• 802.11b/g (WiFi) - 2.4 GHz
• 802.11n (WiFi) - 2.4 GHz | 5 GHz
• 802.11ac (WiFi) - 5 GHz
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