ZyXEL LTE7485-S905 User Guide - Page 186
SIM Card, 28.7 Cellular Signal
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Chapter 28 Troubleshooting 1 Wait more than three minutes. 2 Restart the applications. 28.6 SIM Card The SIM card cannot be detected. 1 Disconnect the Zyxel Device from the power supply. 2 Remove the SIM card from its slot. 3 Clean the SIM card slot of any loose debris using compressed air. 4 Clean the gold connectors on the SIM card with a clean lint-free cloth. 5 Insert the SIM card into its slot and connect the Zyxel Device to the power supply to restart it. I get an Invalid SIM card alert. 1 Make sure you have an active plan with your ISP. 2 Make sure that the Zyxel Device is in the coverage area of a cellular network. 28.7 Cellular Signal How should I position the Zyxel Device to get a strong cellular signal? 1 Find the location of your nearest cellular base station(s), then install the Zyxel Device towards the direction of those sites. The nearest site or site with a direct line-of-sight is usually preferred. Note: It is best to test towards more than one cellular site, as the nearest site / line-of-sight is not always the best due to the terrain, interference, density of usage, etc. All of these factors influence the stability, availability and throughput of the link to the Zyxel Device. 2 Position the Zyxel Device towards a direction where coverage is expected (example the nearest town). 3 Conduct test measurements using the Web Configurator's System Monitor > Cellular WAN Status screen to obtain a report of the cellular network signal strength and quality at various test positions. LTE Series User's Guide 186