for passcode, iPhone supports 4-Digit numeric code (10k combinations), 6-Digit numeric code (1 million combinations), "custom numeric code" (arbitrary length, m

for passcode, iPhone supports 4-Digit numeric code (10k combinations), 6-Digit numeric code (1 million combinations), "custom numeric code" (arbitrary length, millions of combinations), or "custom alphanumeric code" (arbitrary length, millions of combinations)