To get the big clock on iPhone lock screen with iOS 26 (which applies to iPhone 2 models that can run iOS 26):

1. Make sure the iPhone is updated to iOS 26.
2. From the lock screen, long-press anywhere on the screen and tap "Customize."
3. Tap the clock area to open font and language options.
4. Select the Arabic - Western (12-hour) script by tapping the globe icon. This is necessary because only this script supports the big clock style.
5. Choose the default font style (the first one on the left).
6. A drag handle will appear at the bottom right corner of the clock box. Drag it downward to enlarge the clock to your desired size.
7. Tap "Done" to save the changes.

Note: The big clock only appears with the default font in the Arabic-Western script. Other font styles will not enable the bigger clock size. Also, the clock size will adjust automatically depending on your wallpaper and notifications, sometimes shrinking when notifications are open but will be big with no notifications shown. This method works for iPhones running iOS 26 and later, allowing a large, customizable clock on the lock screen for easier reading and a modern look.