Thought I'd pass on some info re Remote Area Phones etc. Although there are many more, I'll only deal with the Telstra Network and note their Blue Tick phones.
Blue tick handsets have been tested by Telstra re their "better" reception in fringe areas. Some are smart phones, some are not and nearly all of them have no specific external antenna capability other than using a cradle with an induction pad connected to an external antenna.
I've done a fair bit of Googling on this topic. To date, I've only found 2 phones that have an external antenna port for a "hard wired" connection to an antenna. I'll also point out that anything else that might be on the internet is probably not locally sourced and there is an issue here. The following is an example...
A while back, I was looking for a Samsung Galaxy J5 dual SIM phone. Kogan had them on their website. So, I went to JB HiFi to perhaps have a look at one. The one they had was single SIM. When , I asked why this is and this is what I was told. "The one JB sold was imported by Samsung Australia (SA) and as such is covered by Samsung's warranty. The one Kogan sold was a European version which is dual SIM, but not supplied by Samsung Australia and as such SA do not cover their warranty or do any repair work on them. The only warranty you have is with Kogan." If correct, be careful what you buy on the internet.
The 2 handsets I found are both Telstra and both made by ZTE. The first is the Flip 3 @ around $120, it is not a smart phone, but is 4G and has WiFi hotspot and VolTe capability. The rest of the specs you can Google.
Here's a pic
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