I experienced the same when I moved from China to US. In China the first time I ever experienced lost of signal was somewhere in the mountains in Tibet. Signal

I experienced the same when I moved from China to US. In China the first time I ever experienced lost of signal was somewhere in the mountains in Tibet. Signal is just everywhere there. US is incredibly bad on that. I live in the bay area and I can make an easy 30min drive to a place with no reception from any carriers. I'm wondering why...