I've got a Canadian S3 (SGH-i747M) that's on the latest OTA update from my provider (Telus Canada) and I requested, obtained (and paid 35$ for!) FROM TELUS my unlock code so I could use the phone with a US SIM card in the United States instead of getting gouged in the eyes and kicked in the balls by the outrageous rates/bundles from Telus. Problem is, the code they gave me doesn't look like it works. Here's what I did: -Obtain code from Telus and order roammobile SIM card on the same day -About a week later, receive my roammobile SIM card -Turn off S3 -Remove battery -Remove Telus SIM card -Insert roammobile SIM card -Start up S3 -Get my screen lock prompt (the one I use to lock the phone, it's a four digit PIN) -Enter correct unlock PIN to gain access to phone -Get the "illegal SIM card detected, please enter unlock code" prompt -Enter correct unlock code obtained by my cell company -Get the "unlock procedure unsuccesful" error -Call Telus back to double-check the code they gave me and the technician I got over the phone ran my IMEI again, still gets the same code so according to TELUS the code is correct -Do a factory reset on my phone by shutting off phone and restarting while holding the power/home/volup buttons and running the factory reset option -Try the SIM again, same result, unlock procedure unsuccesful... Telus have now opened a ticket with Samsung but I don't think it'll be resolved before thursday, I'm going to the US next week-end... Anyone have any other ideas? I've not rooted this phone and always kept it on stock Android versions as downloaded OTA from Telus. Could the roammobile SIM card be defective somehow? Thanks in advance!