I was convinced you were wrong but that's correct. The Mini is much smaller and the Zenfone is about the same size as the regular iPhone.
Zenphones until the 10 had easy to unlock bootloaders, leading to long in official support by the community. However with the 10 ASUS stopped that tool and they've been lying ever since that they're still working on it.
My zenfone is now on its final major android update, the rather minor android 15 version, and I've only got two years of security updates left until I need to look for a new phone. That's one thousand euros for barely four years of software support, it's such a disappointment.
That aside the camera is lackluster, it's auto whitebalance is horrific, turning the same snowy scene into a sunset or illuminated by fluorescent light depending on the phase of the moon and it's sampling questionable making images much more blurry in a surreal way. But the optical stabilisation is seriously impressive. Overall I preferred the pixel 4a's images though. A smaller phone and my zenfone's predecessor.
At least I get to just plug it into my stereo thanks to the 3.5mm jack though.
iPhone 16/Zenfone/13 Mini (in mm)
Height: 147.6/146.5/131.5 - the mini is 15mm shorter than the Zenfone which is only 1.1mm shorter than an iPhone.
Width: 71.6/68.1/64.2 - the mini is 3.9mm thinner than the Zenfone which is 3.5mm thinner than an iPhone
Depth: 7.8/9.4/7.7 - the Zenfone is significantly thicker than the iPhones.
Volume: 82.4/93.8/65.0 cubic cm - the Zenfone is physically larger than an iPhone 16 by a decent margin.
The Zenfone simply isn't close to an iPhone mini size. It's larger than an iPhone by volume and the depth does matter when holding it. If we're talking about front-edge to opposite front-edge, we're talking about 87.2mm for the iPhone vs 86.9mm for the Zenfone and 79.6 for the Mini. The Zenfone saves you 0.3mm in grip-distance over an iPhone, but a Mini saves you 7.6mm in grip-distance.
Heck, let's look at weight. A Zenfone is 172g, iPhone 170g, iPhone mini 141g. The Zenfone is the heaviest of the three.
One of the big limiting factors for Android phone manufacturers is the battery. iOS is a ton more efficient. The Zenfone is thicker to accommodate a 4300mAh battery compared to the iPhone 16's 3561mAh (21% larger battery). And the Zenfone's battery is kinda small by Android standards.
People often don't think about the challenges of making a small phone. The electronics don't shrink. If you need a certain square mm for those electronics, they take up a larger percentage of the interior on your mini. You don't need as large a battery because the screen it is powering is smaller, but not proportional to its size - you're still drawing the same power for all the electronics. So you have a smaller percentage of interior space for the battery and you need a larger battery relative to the interior space - or you need to sacrifice battery life as Apple did with the mini.
For example, the iPhone 13 mini is 84.4 sq cm and has a 2438mAh battery. The iPhone 13 is 104.9 sq cm with a 3240mAh battery. The iPhone 13 is 24% larger, but can accommodate a 33% larger battery - because the electronics take up basically the same space regardless of form factor.
So to make an Android mini, you'd be sacrificing a lot of battery life. The Zenfone is not a mini. Its grip-size is basically identical to an iPhone. In every way, it's much more an iPhone than a mini.
and end-up only Sony products comes out. and I sacrificed performance for a shorter phone so I bought Xperia Ace III.
but I don't know when will my ISP shutdown GSM-1800. If this happens I have to buy Xperia 10 series then.
iPhone 6S: 138.3/67.1/7.1 = 65.9 cc the mini is just barely smaller.
iPhone 4S: 115.2/58.6/9.3 = 62.8 cc smaller than the mini.
Treo 650: 113/59/23 = 153 cc which is about the same volume as a Galaxy Z Fold 3... the displacement was so uncomfortable, people often used hip holsters for the former.
Thumbs up on the headphone jack though. Can't fault it there.