How about a modem only without the wifi?

OK T-Mobile.  I tried your internet service, and speeds are fine where I am.  But your modem is only useful for those with very simple needs, and has very limited user tools.  I need a modem that can be just the modem without the wifi so I can use my existing router with lots of settings not available on your 4GAR that you sent me.

So, please offer a straightforward modem alternative, and I’ll be back!