Your mobile connectivity problems solved. We have had two different Telstra repeaters over the years: a mobile CDMA version and a 3G home version. Where we live the mobile service does not work at all without an external antenna (See this post which is a bit out of date now these new 4G antennae are available).
This used to be a real nuisance until we installed one of Telstra’s 3G phone repeaters ($880 then) in the house (connected to an external omni-directional antenna). Then our phones suddenly had full ‘bars’ both in the house and within about 20 metres of it.
Now they have upgraded the service to 4G LTE/X which means we could access 64 meg internet speeds if we had one of their new Go Antennae and an external antenna – which would be great. I am just waiting to see whether they roll out the 5G network here this year (unlikely – but who knows?) before I invest (quite a lot ) of money on an upgrade. 5G will provide terabytes of speed per minute, so one would not want to miss out on that! It will clearly kill the NBN! Telstra has already rolled it out in lots of places: https://www.telstra.com.au/coverage-networks/5G
The mobile (CDMA) repeater was also great. I used to use it all the time when I was deer hunting for example – before I needed to acquire a satellite phone for my trips to Fiordland and etc. When I was completely out of the mobile coverage area, and even at the bottom of a deep valley, the phone would work every time. It was an immense boost to the normal coverage. If you beef up your mobile external antenna (and particularly the coaxial cable which normally ‘steals’ most of your dBs) you will be astonished. And of course now you can receive 4G Internet coverage too.
These Go Repeaters aren’t cheap but if your communication needs are important to you, you should investigate them.
PS: It seems unlikely 5G will be offered in ‘country areas as the towers would have to be too close together. Here’s what Google says: ‘5G operates in a high-frequency band of the wireless spectrum. Because high frequency waves have a harder time traveling over distance & through objects, the 5G network will be built on small cell site technology with antennas as close as 500 feet apart.’