Verizon Wireless has officially responded to FCC Chairman Tom Wheeler and his data throttling concerns. The Verge has obtained a copy of the carriers response, dated August 1st, which was written by Kathleen Grillo, the companys SVP of Federal Regulatory Affairs. In it, Verizon underlines the notion that customers will only experience slowdowns under very limited circumstances. It will only happen at particular cell sites experiencing unusually high demand, the letter reads. Verizon notes that any throttling will cease immediately when demand on a strained cell site returns to normal.