https://devzone.nordicsemi.com/f/nordic-q-a/55290/dropping-cell-connection-on-at-t-band-17-on-twilio-super-simWe are having problems staying on AT&amp;T&#39;s CAT-M network in the US using Twilio Super SIMs. We are able to successfully stay connected with other roaming SIMs such as Hologram. Can someone please look at the modem trace I&#39;ve attached here and tell usen-USTelligent Community 13Thu, 12 Dec 2019 15:46:55 GMThttps://devzone.nordicsemi.com/thread/225219?ContentTypeID=1Thu, 12 Dec 2019 15:46:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:db1de4d1-dfc0-4bef-9090-30ea053f2d6bJoshua<p>AT&amp;T only supports Bands 2, 4 and 12 for Cat M.&nbsp; We have seen our device connect to band 17 but it does not function properly.&nbsp; Try using the band lock to only allow bands 2, 4, 12 and see if that helps.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/224658?ContentTypeID=1Tue, 10 Dec 2019 10:07:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7bf41085-6745-43cb-9de2-bfa525716352Hakon<p>Hello,</p> <p>the modem trace you provided is empty. Please follow this procudure when performing <a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/how-to-get-modem-trace-using-trace-collector-in-nrf-connect">modem trace</a>.</p> <p>Have you used release 1.0.0? And if yes, was this SIM card working with 1.0.0 release?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/224521?ContentTypeID=1Mon, 09 Dec 2019 15:55:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:111bf4fe-36c1-4d6f-a9fc-21c32afda14aHakon<p>Hello,</p> <p>the modem trace you uploaded is being looked at. I will let you know when I have the results.</p><div style="clear:both;"></div>