https://devzone.nordicsemi.com/f/nordic-q-a/54033/shut-down-the-modem-nrf9160Dear All, I want to program a device to perform the following actions: Start-&gt;configure modem to connect to NB IOT, adjust the PSM and EDRX-&gt;potentially send a message-&gt;switch off the modem and go to sleep. To configure the modem, I am using theen-USTelligent Community 13Tue, 05 Nov 2019 15:03:18 GMThttps://devzone.nordicsemi.com/thread/218635?ContentTypeID=1Tue, 05 Nov 2019 15:03:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b68cf776-0ecc-4247-acd7-b0447c827acaEdP<p>I may be wrong but I believe that I&#39;ve read about this somewhere. If memory serves me well, cfun 4 means that modem is offline but its interface to MCU is up. When you at+cfun=0 you also turn the MCU interface off. Bun when you query the modem again with at+cfun=? interface wakes up and you have cfun 4 again.</p> <p>&nbsp;In the other words, don&#39;t at your modem after at+cfun=0</p> <p>&nbsp;Can you compare current consumption before and after at+cfun=0 ?</p> <p></p><div style="clear:both;"></div>