QUESTION: Given a valid 8-digit unlock code, what is the procedure to unlock the T-Mobile pay-as-you-go ZTE Concord cellphone? I've had a pay-as-you-go T-Mobile ZTE Concord, bought at Target, on a T-Mobile contract plan for months. I contacted T-Mobile 3 weeks ago and they finally sent me the 8-digit unlock code. But T-Mobile support had me type 3 different procedures to unlock, all of which failed. Since the phone can be bricked if we do this wrong too many times, I ask here: Q: What is the unlock procedure for the ZTE Concord given I have the IMEI and the 8-digit unlock code, and a 2-year old AT&T now defunct SIM card? Here's what they had me do first: a) Confirm the IMEI of the ZTE Concord by typing *#06#, with the T-Mobile SIM in place (this works fine) b) Remove battery to put in the AT&T (i.e., foreign) SIM card & replace battery c) Boot phone which reports d) Enter **05*PUK*PIN*PIN# e) Then it asks for the old PUK and the new PUK f) Then it fails and decrements from (10) to (9). We tried that three times, and it decremented from (10) to (9) to (8) before I put a stop to this nonsense. I really don't think T-Mobile knows what it's doing when it comes to unlocking the ZTE Concord. I asked for technical support, who had me do a DIFFERENT procedure, which I show below in photos. 0. With foreign (AT&T) SIM card in place, I boot the T-Mobile ZTE Concord cellphone 1. This shows the "long press to unlock" screen, saying NO SIM card. Emergency calls only. 2. I long press & it says "SIM network is locked" "Emergency Dialer" 3. I press "Emergency Dialer" and it brings me to the Emergency Dialer 4. I type "*#06#" and it's supposed to ask for the unlock code, but it just sits there. QUESTION: Given a valid 8-digit unlock code, what is the procedure to unlock the T-Mobile pay-as-you-go ZTE Concord cellphone?