SM5100B communication band selection for North America Posted by: Alvin Jin , January 21, 2014 By default, the frequency band is 900/1800. If for North America, you need to set to 850/1900. AT command will do the trick, AT+SBAND=7 will set it to 850/1900, and if you power cycle the module, it stays there. Share! Tweet Alvin Jin About the author Leave a Reply Cancel replyYou must be logged in to post a comment.