https://www.theverge.com/circuitbreaker/2018/9/13/17854826/oneplus-6t-battery-android-headphone-jack

The OnePlus 6 is one of the best Android flagship phones with a headphone jack, but its eventual successor — expected to be called the OnePlus 6T — won’t have one, according to OnePlus’ co-founder Carl Pei. In an interview with TechRadar, Pei said the decision was justified. “We found 59% of our community already owned wireless headphones earlier this year - and that was before we launched our Bullets Wireless headphones,” he said.

It’s not that OnePlus’ reasoning is to go on a crusade against the headphone jack. The company wants to deliver an optimal set of features, and Pei thinks that it’s worth removing the 3.5mm audio jack in favor of something better: battery life. “By removing the jack we’ve freed up more space, allowing us to put more new technology into the product,” he said.