I bought a GL E750C4 about 2 months ago directly from you online, and so far I had connected it through WAN, but now that I tested it with a sim it says “SIM card not registered”. I’ve tried two sims from 2 different major providers (Starhub and Singtel, in Singapore) and none work.
Both sims work without issues on my Samsung phone, i.e. I can browse pages.
Can you guide me on how I can troubleshoot? you can get technical with me if needed.
Thanks in advance!