T-Mobile connectivity

FAQ
1
I am trying to connect and Inhand IR615 to T-Mobile.  I have tried custom settings with the APN of fast.t-mobile.com with no success.  Please let me know if you have any suggestions.
2
You can find all our latest firmware on our website, for IR615 it will be here(click Documentation):
https://doc-center.inhandnetworks.com/IndustrialDigitalization/InRouter/IR615-S

Once you upgrade, change the APN under Network>Cellular to mobilenet or fast.t-mobile.com and see if you get an IP on the Cellular interface under Status>Network Connections.