5g home internet - phone not autoconnecting..

The output of the T-Mobile 5g Home Internet can only be set to frequency band 2.5ghz or 5ghz.  It cannot output both at the same time like a router does. I have a couple of older items that can only use band 2.5ghz like my robotic vacuum, so I have to use the 2.5ghz band for everything. It's like a Naval convoy that is only as fast as the slowest ship. Also I cannot auto connect with my phone when I return home. So a work around is I use an extender to auto connect, but it seems slower than if I manually connect to the Home Internet. I am curious if the new Verizon Home Internet can auto connect.