Hi guys, I've got this Huawei prepaid pocket wifi which was working perfectly fine - the last time I used it was June 2nd. Now I'm getting a red signal indicator. I have tried all the basic troubleshooting - switching sim cards and switching phones, rebooting the device, called customer service and made sure APN is correct - everything. Now it is currently inserted to one of my spare phone, and it says "Invalid sim". I go to Network setting and tried manually selecting the Globe network and it won't let me. It just says Invalid sim. Now what's next?