That's somewhat misleading.
The radio regulations for on-board base stations were passed years ago - 2007, I think. That dealt with the safety of that unit and the phones using it, including preventing them connecting to base stations on the ground. That would cause serious problems to the way cellphone systems track phones between cells, but of course it would also avoid the charges for on-board use.
However, that was only a minor step. The big issue - whether an aircraft might be adversely affected - was a matter for airworthiness certification, now dealt with by
EASA» for Europe and the FAA for the USA. We all know it's not a real problem since loads of people leave phones on by mistake and nothing happens. But I understood that new aircraft were being certified for phones (and other things) on board, while existing ones were not because doing it after the design stage was expensive and the cost would fall on airlines not manufacturers.
So a general rule had to wait until enough aircraft were certified for it to make sense. And that still leaves a problem where individual airlines, or some aircraft of one airline, require a "no phones" or even "none of these PEDs" rule. A lot of people would not understand why the rule varies for no apparent reason.
The FAA still says "no voice calls", blaming the
FCC▸ - who always said it was up to the FAA.
Their equivalent announcement (from last October) still includes the general relaxing of rules on PEDs, which of course either have no transmitter or low-power ones for short range (Bluetooth or WiFi).
EASA's own announcement is much less clear, but if you follow the links through for more details it does refer to the need for aircraft certification.