https://devzone.nordicsemi.com/f/nordic-q-a/80890/nrf9160-recommended-sim-card-interface-schematicHi. Simcom SIM7000 series datasheet recommends the following schematic: Simcoms SIM800C module datasheet recommends the following schematic: Quectel BG96 module datasheet recommends the following schematic: Please observe that between theen-USTelligent Community 13Thu, 21 Oct 2021 11:46:44 GMThttps://devzone.nordicsemi.com/thread/335289?ContentTypeID=1Thu, 21 Oct 2021 11:46:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c44b2585-2862-4f3f-81d5-c95d64552963ketiljo<p>You can find more about this here:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/uicc_if_esd.html">https://infocenter.nordicsemi.com/topic/nwp_037/WP/nwp_037/uicc_if_esd.html</a></p> <p>With a SIM card connector, it&#39;s recommended to use diodes and caps, as described in the link, or a dedicated ESD protection device. No series resistors.&nbsp;</p><div style="clear:both;"></div>