The big cellular providers don't really move with the times as fast as we would like. That's usually because there's profit to be made dragging their heels.
A good example is texting. For years, the providers were charging customers an arm and a leg for texting plans when the feature cost them essentially nothing to provide.
Thankfully, the rise of smartphones and free texting apps finally made providers move to unlimited texting plans. Click here for other ways to save money on your cellular bill.
Another thing carriers have been slow to adopt is Wi-Fi. There have been apps that make calls and send texts over Wi-Fi for years, but carriers still require you to use a cellular connection. And if you've ever run out of cell minutes on your monthly plan, you know how valuable every single second can be.