That is how I use it, and read a post suggesting that. I'd very happily hear otherwise. I'd not give up android based on that because tower plus solo is awesome. But it's annoying. I'd guess same as cellular hotspotting over wifi. Connect via your phone first then connect to solo after maps download.
Maybe the magic ticket is hotspot over phone Bluetooth if can, still connected to solo wifi. Doubt it. It's p2p wireless. You would need solo to be able to connect to infrastructure ap