XM and WiFi-- Can I use any wifi?

I understand that XM uses XFINITY hotspots when available.  My question is- can any wifi, not just XFINITY be used the same way (I mean for talk and text of coarse)?  I'm asking this because I own my router and modem, therefore I don't host a hotspot at home, but do have wifi. This could also be handy because I sometimes travel to locations without XM hotspots, but I might have wifi which would help with data.