If it works, then you're in the clear.
If not, you'll probably notice that instead of the uppercase 'i', you'll get an 'A' or random question mark box:
It could even convert into a '#'.
The bug has been a problem for many iPhone users, including Kim Kardashian, so nobody is safe, clearly.
It's been incredibly frustrating for iPhone users, who have never appreciated the uppercase 'i' until now.
Apple also offered a quick fix solution: try setting up text replacement for the letter 'i'.
1. Go to Settings > General > Keyboard > Text Replacement.
2. Tap +.
3. For Phrase, type an upper-case 'I'. For Shortcut, type a lower-case 'i'.
So there ya go!