WiFi: 2.4 GHz<p>GSM: 0.9 - 1.9 GHz (UMTS, LTE go up to ~3 GHz)<p>Microwave ovens: 0.9 - 2.4 GHz [1]<p>Seems like more or less the same wavelength to me.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Microwave_oven#Principles" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Microwave_oven#Principles</a>