4 inch mini is fine for children, but is a wee bit too narrow for the keyboard
I consider 5 inch doesn't fit pockets of work uniform, so 4.5 inch would suit me
I find LG, Huawei, Moto and Samsung have 4.5 inch models, which don't seem to be sold in Terra Nullius. About the only thing I have seen is Nokia 1 at Hardly Normal.
All the phones sold by Optus on contract are available on their website.
If you wish to buy your own phone from online or other sources, just make sure it supports the Optus frequencies and you'll be good to go.
Well yes I did search before asking the question. But nobody seems to sell them. The Sony has nice specs, but I only see used phones being listed. The only other 4.5" I can actually buy is Huawei Y3 II. So I ended up buying the Nokia. I had Nokia phones in the past, but this is rubbish. Just a case of the badge being bought by Foxconn.