Verizon and AT&T customers are getting slower speeds because of unlimited data plans

Unlimited data plans are slowing down mobile speeds for Verizon and AT&T customers, according to data released by mobile network measurement company OpenSignal.

Verizon and AT&T reinstated their unlimited plans in February to compete with T-Mobile and Sprint, which have long offered unlimited data plans, and have since seen a deluge of demand. Greater data demand — either more data usage or more customers — means slower speeds. Think of it as increased traffic on a highway. Verizon and AT&T also have nearly double the subscribers of T-Mobile and Sprint, so changes in their offerings hit their networks harder. Carriers have long supported greater leeway to manage their networks as part of the US government’s fierce debate over net neutrality. T-Mobile’s unlimited plan often limits video streaming quality in a bid to ease the burden on its network; others like Verizon recently have tested similar tools to improve speeds. To staunch advocates of open internet rules, however, these techniques violate the spirit of federal safeguards meant to ensure all web traffic is treated equally. Both Verizon and AT&T saw a notable decline in speeds after introducing unlimited plans.