Daytime: I sit in front of a desktop with relatively unencumbered internet access.
Evenings: If I choose to use the internet (and I usually do), my desktop has full internet access.
Commute: I cycle to and from work, no chance to use the internet
My Nokia brick is on a pre-paid plan, mostly just texting my wife, costs about $5 per month. There is zero requirement for me to check work emails out of office hours, and anything other than a full keyboard drives me crazy. For my use case a smart phone and data plan would be redundant.