Wi-Fi Password 0 or O? Fixing Look-Alike Characters
Short answer: if a Wi-Fi password from a sign fails, check the look-alike characters first: 0/O, 1/l/I, 5/S, 2/Z and 8/B. Swap one at a time and retry. Passwords are case-sensitive, so O and o are different too.
The usual suspects
0 (zero) and O (letter), 1 (one), l (lower-case L) and I (upper-case i), 5 and S, 2 and Z, 8 and B. Many café and hotel signs use rounded fonts or handwriting where these look identical.
How to guess the right one
Look at the pattern: a run of digits like "2024" is probably all numbers; a word like "COFFEE" is probably all letters. Zero is often narrower than O, and some fonts put a slash or dot in it.
Try in a smart order
Change only one ambiguous character per attempt, starting with the one that breaks the pattern. If several are ambiguous, ask the staff; that is faster than ten retries.
Doing it with Signfi
Signfi reads the password from the sign and shows each look-alike character as a chip. Tap a chip to switch 0 to O or 1 to l without retyping the whole password, then connect.
FAQ
Are Wi-Fi passwords case-sensitive?
Yes. WPA passwords are case-sensitive, so O, o and 0 are three different characters.
Why does the network name also fail?
The SSID is case-sensitive too. Pick it from the list of nearby networks when you can.
What other characters get mixed up?
2 and Z, 8 and B, rn and m, and similar-looking hyphens or underscores.