What led to this discovery? I realized that my phone, which has an affinity for 3G, has been quite sketchy of late. How can I sure there are bubbles? Well, my bed in the hotel room is in such a bubble. Most other places in a several mile radius have provided wonderful 3G... except my bed. So, when does this bubble lead back to? All I can be sure of is that it goes back to a time before 3G was a twinkle in somebody's eye. The phone still works so it can't be too far into the past.