FWIW, my Virgin Mobile plan costs $60 a month and isn't slowed until 23 gigabytes. Their unlimited plans for new customers are $50 per month.
As much as Google touts the "flexibility" to theoretically pay less, using less than 6 gigabytes is pretty difficult in 2018 unless you use very few services and have no interest in video.
As much as Google touts the "flexibility" to theoretically pay less, using less than 6 gigabytes is pretty difficult in 2018 unless you use very few services and have no interest in video.