<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">For the development modem, I’ve chosen a simple SIMCOM SIM5360 3G modem. Just something to get us started with. The board we are making will also support a SIM7100 4G modem chip as well. Most recent SIMCOM modules are compatible.</div><div class=""><br class=""></div><div class="">Specifications for the modem are here:</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><a href="http://simcomm2m.com/En/module/detail.aspx?id=82" class="">http://simcomm2m.com/En/module/detail.aspx?id=82</a></div></blockquote><div class=""><br class=""></div><div class="">There are three models available:</div><div class=""><br class=""></div><div class=""><ul class="MailOutline"><li class="">SIM5360A<br class="">Dual-Band UMTS/HSPA+ 850/1900MHz<br class=""><br class=""></li><li class="">SIM5360(J)E<br class="">Dual-Band UMTS/HSPA+ 900/2100MHz<br class=""><br class=""></li><li class="">SIM5360J(D)<br class="">Dual-Band UMTS/HSPA+ 800(850)/2100MHz</li></ul></div><div class=""><br class=""></div><div class="">The 2G frequencies are all quad-band (GSM/GPRS/EDGE 850/900/1800/1900MHz). The only difference is the dual-band UMTS/HSPA+ frequencies 850/1900MHz, 900/2100MHz, or 800(850)/2100MHz.</div><div class=""><br class=""></div><div class="">Hong Kong uses:</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><a href="https://www.frequencycheck.com/carriers/csl-hong-kong" class="">https://www.frequencycheck.com/carriers/csl-hong-kong</a></div><div class=""><br class=""></div><div class=""><table class="table-striped table-bordered table table-hover" style="box-sizing: border-box; border-spacing: 0px; border-collapse: collapse; background-color: rgb(255, 255, 255); width: 750px; max-width: 100%; margin-bottom: 20px; border: 1px solid rgb(221, 221, 221); color: rgb(119, 119, 119); font-family: 'Open Sans', Arial, sans-serif; font-size: 14px; orphans: 2; widows: 2; padding: 0px;"><tbody style="box-sizing: border-box;" class=""><tr style="box-sizing: border-box; background-color: rgb(249, 249, 249);" class=""><th class="col-xs-6" style="box-sizing: border-box; padding: 8px; position: static; min-height: 1px; float: none; width: 375px; line-height: 1.42857; vertical-align: top; border: 1px solid rgb(221, 221, 221);">Name</th><th class="col-xs-6" style="box-sizing: border-box; padding: 8px; position: static; min-height: 1px; float: none; width: 374px; line-height: 1.42857; vertical-align: top; border: 1px solid rgb(221, 221, 221);">Interface</th></tr><tr style="box-sizing: border-box;" class=""><td style="box-sizing: border-box; padding: 8px; line-height: 1.42857; vertical-align: top; border: 1px solid rgb(221, 221, 221);" class=""><a href="https://www.frequencycheck.com/bands/umts-hspa-band-1-2100" style="box-sizing: border-box; background-color: transparent; color: rgb(0, 136, 204); text-decoration: none; outline: none !important;" class="">B1 (2100)</a></td><td style="box-sizing: border-box; padding: 8px; line-height: 1.42857; vertical-align: top; border: 1px solid rgb(221, 221, 221);" class=""><a href="https://www.frequencycheck.com/interfaces/umts-hspa" style="box-sizing: border-box; background-color: transparent; color: rgb(0, 136, 204); text-decoration: none; outline: none !important;" class="">UMTS</a></td></tr><tr style="box-sizing: border-box; background-color: rgb(249, 249, 249);" class=""><td style="box-sizing: border-box; padding: 8px; line-height: 1.42857; vertical-align: top; border: 1px solid rgb(221, 221, 221);" class=""><a href="https://www.frequencycheck.com/bands/umts-hspa-band-8-900-gsm" style="box-sizing: border-box; background-color: transparent; color: rgb(0, 136, 204); text-decoration: none; outline: none !important;" class="">B8 (900 GSM)</a></td><td style="box-sizing: border-box; padding: 8px; line-height: 1.42857; vertical-align: top; border: 1px solid rgb(221, 221, 221);" class=""><a href="https://www.frequencycheck.com/interfaces/umts-hspa" style="box-sizing: border-box; background-color: transparent; color: rgb(0, 136, 204); text-decoration: none; outline: none !important;" class="">UMTS</a></td></tr></tbody></table><div class="">So, the first development modem I am getting is SIM5360(J)E.</div></div></blockquote><div class=""><br class=""></div><div class="">For other developers, who will be wanting early OVMS v3 modules, where do you live, what cellular carrier do you use, and what frequencies do you use?</div><div class=""><br class=""></div><div class="">Regards, Mark.</div><div class=""><br class=""></div></body></html>