Thanks for that explanation,
@navigates, I had no idea that was how declining works in some parts of the world. Interesting.
It happens every time over here. You get a call and there is no way to decline amicably. If you hit the "Send to Voicemail" the other person's screen changes from Ringing to "Declined". People even comment later that you keep declining my calls. If it is a landline that is calling, the ringtone changes from Call tone to Busy, thus informing the other user that you have declined. However, if you just don't pick up the phone, the caller gets the message "The Caller cannot be reached or is outside the coverage area, please try your call again later"
More than Apple changing this functionality, I feel the network provider should change their way of this as I'm sure this affects everyone.
The other annoying thing here is the lack of data when you are on a call. I mean its 2018. The network is so superior that it can handle 150 Mbps of download but yet you cannot use the data while on call.
One more point of contention here is that if you are a resident "Sim" you will get 4G at best which is good, however, if you roam in this country you will get connected to "LTE" and all VOIP's are unblocked along with voice and data. And when you go to their office with a roaming sim and ask them to explain, they will give you a vague explanation that it's not technically possible.
Technically there are only two providers. All others are an offshoot of the two primary providers and they work in unison. Infrastructure is superior and you don't have to worry about coverage but it lacks in other areas.