Comment A lot of it is modem quality (Score 1) 25
If you buy one of the cheaper mediatek phones, some of which get up to about $500, they have good performance on the soc but the modems suck and they don't maintain connectivity.
The Google modems stunk too, I've heard some people say the very latest ones are better but I haven't tried them. If I'm going to drop $700 on a modem I can just pick up a OnePlus 15r with a Qualcomm Snapdragon 8 Gen 5 and an x85 modem to go with it.
That's for Android. For iOS The actual Apple modems when they use their own really suck. Although I think they still use Qualcomm modems in a lot of their hardware. You do have to pay attention though.
For years I'd connectivity problems and my kid on iOS didn't and it was the modem more than anything else. Finally switching to a Qualcomm based chipset and modem solved to those connectivity problems. The downside is you really want at least the x75 modem just because one of the other problems is 5G was rolled out in completely and a lot of early 5G phone modems really suck and are missing tons of important features.