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AFAIK cellphones predominantly used 700-900MHz band in the past, and moved to ~2GHz band recently for HSPA/4G LTE Also there has been a lot of usage of 2.4GHz

by btian 14y ago

AFAIK cellphones predominantly used 700-900MHz band in the past, and moved to ~2GHz band recently for HSPA/4G LTE Also there has been a lot of usage of 2.4GHz devices in recent years.

ImprovedSilence 14y ago
>>Also there has been a lot of usage of 2.4GHz devices in recent years. bluetooth? - low power, doesn't travel far wifi - been around long before 2005 cell phones - don't use 2.4 unless BT or wi-fi, have also been in the 1800/1900 gsm bands long before LTE/data networks microwave ovens - been around forever. Doesn't seem to add up. not saying RF doesn't hurt, just playing devils advocate.