GSM900 is 890-915 MHz; 802.11ah gets around this by using region specific frequencies that sidestep GSM900:<p>902-928 MHz in the US  (26 MHz bandwidth)<p>863-868 MHz in Europe  (5 MHz bandwidth)<p>916.5-927.5 MHz in Japan (11 MHz bandwidth)<p>Limited bandwidth, especially in Europe, will to lead to both higher power consumption and lower real-world range.<p>&gt;The PHY layer will allow devices and APs to operate over different sub-1GHz ISM bands, depending on the country regulations: 863-868 MHz in Europe, 902-928 MHz in the US, and 916.5-927.5 MHz in Japan. China, South Korea, and Singapore also have specific channels.<p>Reference: <a href="http:&#x2F;&#x2F;www.networkcomputing.com&#x2F;wireless-infrastructure&#x2F;sub-1ghz-wireless-the-low-power-wifi-solution&#x2F;a&#x2F;d-id&#x2F;1315850" rel="nofollow">http:&#x2F;&#x2F;www.networkcomputing.com&#x2F;wireless-infrastructure&#x2F;sub-...</a>