Ummā¦stupid me, playing with my new cell phone and showing it off, locked my cell phoneās SIM card. I have no idea of where to get the pin number to unlock it. Itās pretty important since this is the only means for people to contact me aside from e-mail and I have phone calls that I need to make, especially in the very near-future and I hope I wonāt have to wait until Monday. Itās from Taiwan Cellular, but I purchased the card at a 7-11. I still have the actual card that it punched out from, so I am hoping that the numberās somewhere on that. How do I get the PUK number to unlock my card? Should I visit the night markets and ask them how they do it? I know itās the SIM card thatās locked (I also fooled around with the phone lock, but hopefully, I donāt think I succeeded), because I tried moving it to my old cell phone and it asked for the PUK code again. What can I do? 
Call 188 - Thatās Taiwan Cellular Customer Service - from a friendās cell phone (make sure friendās phone is also using Taiwan Cellular). Theyāll be able to talk you through it. 
Thank you thank you thank you thank you! I will do as soon as I come back from my 1-1.
My Sim card was recently PUK-locked as well. Is the Customer Service Center for Taiwan Mobile (å°ē£å¤§å„大) still the same? Do they have English speaking reps?
ImaniOU, do you remember the outcome from way back in 2003?
Happened to me as well. Yes they have English speaking reps. Theyāll ask you a few questions (name, birthday, etc) to make sure itās really your SIM, then theyāll give you the PUK to unlock it.
Thanks for the info!
After they give you your PUK code is it pretty straightforward to unlock it or do I have to use the this complicated way I found on the internet:
1) Contact your mobile provider (from another phone) and ask for the PUK code. After a security check they will give you an 8-digit number.
2) On the Nexus One tap āEmergency calls onlyā and you will be shown the usual dialer (donāt worry, it wonāt call any emergency service, just show you the dialer!).
3) Think of a new 4-digit PIN number.
4) Type this code into the Nexus Oneās dialer:
05#*
For example:
I received the PUK code 62862993 from my mobile provider and I want my PIN to be 1234:
056286299312341234#*
I am using a Galaxy Nexus.
If I remeber it correctly I put in the PUK (after keying in the wrong PIN three times phone says something along the line of āPlease put in PUKā) and then my phone asked me to put in a new PIN. But that was on my old backup Nokia. No idea how itās gonna work on the Galaxy Nexus. Just give it a try?
For that reason ā¦ just keep the original PIN ā¦ 0000 
āSIM card locked. Enter PUK. Contact your service provider for details.ā
What da PUK?!!!
Someone been trying to access my phoneā¦hmmmā¦
A problem that spans generations.
Freaginā did it again. Entered wrong code becauseā¦
After restart, asks to enter something, Iām thinking password which I enter multiple times, but NO, it wants the SIM card PUK code, which is 0000 by the way for all Changhua SIM cards, not a secret.
But only 3 chances to enter a nonchalant PUK code. Failed.
Donāt really need SIM actually.
Only need Wifi, which is everywhere.
So, letās see how long I can go without my SIM card working.
I think can just call them and they will turn it on. Or drop into a shop.
I think thatās not the PUK code youāre referring to but rather some other SIM-card-related passcode? My Chunghwa PUK code is eight digits (5893****), for example.
I remember some other passcode necessary for logging in to the Chunghwa app, which I think was 0000 as you said.