<html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body text="#663300" bgcolor="#FFFFFF"> I have a linux filesystem (Debian based) for an embedded board which uses a Quectel UC20 3G modem via NetworkManager/ModemManager. I want to upgrade to use a Quectel EC21 4G modem and want to know if I can use the same "system-connections" configuration file for both modems. e.g. so that same software can run on new and old hardware - or do I have to have separate config/connection files for each modem? My 3G configuration looks like this: <blockquote><tt>id=telstra-mobile-broadband-1</tt><tt> </tt><tt>uuid=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx</tt><tt> </tt><tt>type=gsm</tt><tt> </tt><tt>permissions=user:root:;</tt><tt> </tt><tt>autoconnect=true</tt><tt> </tt><tt> </tt><tt>[gsm]</tt><tt> </tt><tt>number=*99#</tt><tt> </tt><tt>password-flags=1</tt><tt> </tt><tt>apn-telstra.extranet</tt><tt> </tt><tt> </tt><tt>[ipv4]</tt><tt> </tt><tt>method=auto</tt><tt> </tt><tt> </tt><tt>[serial]</tt><tt> </tt><tt>baud=115200</tt> </blockquote> Should this same config file work with a 4G modem (EC21) ? Can I have the one configuation file that will work on 4G and 3G (e.g. if only 3G is available). I'm *assuming* yes. If so, how to configure it. And 3G fallback also. Is there anything special I need to do in configuration, or will ModemManager just wield its magic. Thanks, Brendan. </body> </html>