The entire home screen of the original iPhone (320x480 pixels) is about the size of 2 icons on the iPhone X home screen (1125x2436 pixels). This pic shows one overlayed on the
iOS 16: How to Change Apps icon Size in iPhone, iPad
How to Increase the Size of Text and Icons on an iPhone
iOS 16: How to Change Apps icon Size in iPhone, iPad
How to Make iPad Home Screen Icons Bigger or Smaller (iPadOS 16)
Creating Home Screen Icons for iOS and Android Devices - Designmodo
iPhone Smart Stacks Will Make You Love Your Home Screen - CNET
How to use iPhone home screen widgets in iOS 14 - 9to5Mac