I used a 4 digit pin to lock my android phone. I have always used a combination of my children, my grandchildren and my husband's and I birthrates but none of these have worked. How can I unlock my device without my 4 digit pin.
Try putting it in slowly sometimes you go too fast it can use incorrect words/letter , if still issue you'll have to go in recovery and do a factory reset
Welcome to Android Central! Which phone? If it's a Samsung phone, you can also try using Find My Mobile to remotely unlock: https://findmymobile.samsung.com/