Things move fast in the madcap world of cellular telecommunications.
Verizon introduced a $99 unlimited calling plan. Five hours later, AT&T matches their offer with a $99 plan of their own. Then, three hours later, T-Mobile drops their own $99 plan, but includes unlimited text and MMS.
This will only really help people who talk way too much on their cell phones. Chronic texters will also benefit from T-Mobile's plan.
Fun Fact: There are 43,200 minutes in a 30-day month. Use them all and bankrupt your cell provider.