According to a report by OpenSignal, Verizon's and AT&T's 4G LTE download speeds have gotten slower in the months since the carriers brought back unlimited data plans. Between OpenSignal’s February 2017 and August 2017 reports, AT&T’s average speed fell 6.8 percent to 12.92 Mbps while Verizon’s fell a whopping 11.7 percent to 14.91 Mbps. OpenSignal doesn’t suggest that there's anything nefarious happening, only that increased demand is resulting in overall slower speeds. Interestingly, both Sprint (by far the slowest carrier) and T-Mobile (the faster carrier), which have offered unlimited data for years, saw an increase in their average speeds during this period: 8.6 percent for Sprint and 4.8 percent for T-Mobile. follow link
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AT&T and Verizon Networks Slow Down after Unlimited Plans