The best signal was had by hanging my phone from the ceiling. Since the phone itself was connected to the cafe Wifi, I couldn't use wifi to connect to the phone

The best signal was had by hanging my phone from the ceiling. Since the phone itself was connected to the cafe Wifi, I couldn't use wifi to connect to the phone. So I shared the phone's (cafe wifi) internet over Bluetooth. (I didn't know that was a thing until I tried it!) (I think I was able to connect to that with another phone and set up a wifi hotspot for all my devices... but it's been a while!)