GL-X300BRC4 will not register T-Mobile SIM

Routers Cellular, USB modems
26 
gl_modem -B 1-1 AT 'AT$QCPRFMOD=PID:1,OVRRIDEHOPDP:"IP"'   --ssh
or 
AT$QCPRFMOD=PID:1,OVRRIDEHOPDP:"IP"    ---webui

reboot

T-mobile Static ip address Only ipv4 addresses are supported
Ipv6 dial-up is used, causing network injection failure. Procedure
Mandatory ipv4

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