To get the big clock on iOS 2 (more accurately iOS 26, as the big clock feature is part of iOS 26), follow these steps:

1. Unlock your iPhone without going to the Home Screen, so you are on the Lock Screen.
2. Long press anywhere on the Lock Screen until the customization mode appears.
3. Tap "Customize."
4. Tap the digital clock at the top to bring up its controls.
5. Make sure you select the default clock font style (the first option on the left), as only the default font supports resizing.
6. Look for the small pull tab or handle at the bottom right corner of the clock frame.
7. Drag this pull tab downward to make the clock bigger. You can drag it to take nearly half the screen.
8. Select the clock color if desired, then tap "Done" to save your changes.

If the clock resize handle does not appear, it is likely because you are using a different clock font or style other than the default one. Only the default clock font style allows resizing. This feature is available starting with iOS 26 and works on iPhones running this version or later. The larger clock makes it easier to read and gives your Lock Screen a cleaner, more modern look.

If clarification is needed about "iOS 2," it's most likely a typo or misunderstanding, as this large clock feature is new to the very recent iOS 26 update.