Without being able to make that distinction, it's nearly impossible to force phone software makers to write rules preventing "illegal" phone use in situations where it is illegal.
Instead, they punish using verifiable methods such as direct observation (cop sees you doing it).
The situation may be similar for recording calls (I'm not familiar with exact laws in this area), but I'm assuming there are also privacy restrictions in calling which lead to the software restrictions.
I remember once using something called HearSayApp, but it disappeared off the face of the internet without a trace. It used HTML5 to place a call, somehow. And the audio was crystal clear.
It's probably got something to do with some kind of regulations. Voice changers are fun, but not when calling 911, for example. Maybe it's a requirement that the sound goes directly to the baseband or something?
They could get around it the same way Toyota limits their liability from me using the touch screen while I drive - pop up a message saying when and how the feature should be used.
For call recording, the phone maker is potentially facilitating a felony. It's really complex. Does the phone stop recording when you cross state lines? Does it allow covert recording?
If I'm from California recording a call in DC on vacation and accidentally enter Maryland and get arrested, I'm suing the company.
Likewise, if you are in California, you can't send a text while driving, but you can enter an address into the GPS app (probably).
All Apple and Google would have to do is warn you that recording calls may be illegal.
Radio Shack sold phone recorders in every state and AFAIK, nobody ever sued them.
I have Google Voice and Google lets me record calls on that. I'm not sure what the big difference is for when the call is over Android.
Edit: There have been cell phones that had call recorders built in, just none that run Android or iOS (AFAIK). I know a lot of Motorola phones included the functionality.
http://www.howtogeek.com/194839/how-to-record-a-call-on-your...