Not connecting to wifi

Hi everybody, here's the problem I'm needing help with.
My modem broke left it without a pw thinking it was the router , but no.
So I have a sierra hotspot from sprint , but my phone isn't connecting to it.
It keeps telling me I could connect to my router instead despite the fact that my pw on it is correct , also my computer & 2 roku's can connect to it.
Any ideas on why this is happening I would appreciate any help.
Thanks,
Tony