ditching tplink archer c5v

My equipment:
Huawei WS880 flashed to Xwrt-Vortex
TM's own Huawei HG8240W
Huawei E8372
-FYI, i can't get the provided ZTE MF833V to work with PC/other router. It can only work with the provided tplink router.
When connected to other PC/router, only DNS lookup can be resolved, Internet packet won't go through.
For this, i replaced it with my own Huawei E8372. If your dongle can work with PC, there's shouldn't be any issue for it to work with other router.

Setting for Dual WAN
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-Ignore that I selected USB device as Android phone instead of USB modem as both mode will work since Huawei E8372 or ZTE MF833V works in hostless modem mode. APN should be configured on the dongle, not on the router.
Setting for VOIP
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