New iPhone 3GS 8GB Uses Toshiba Baseband Chip Not Compatible with iPad Baseband 6.15.00

How does Apple prevent people from unlocking their brand new iPhone 3GS 8GB? They replaced one of the components inside! As it turns out any 3GS produced after week 28 of year 2011 (sometime in July) is made with Toshiba baseband chip, as opposed to Infineon baseband chip.

If you attempt to flash it using iPad baseband 6.15.00 there is a risk of bricking your phone! Take this as a warning!
The typical symptoms of a corrupted baseband chip are:

• No WiFi
• No ECID
• No IMEI
• No Bluetooth

Please take note of serial number of up to XXX109XXX may NOT be compatible with the iPad baseband. See example below:

XX109XX = 1 is the year of 2011 and 09 is week 9 of 1 year

If the serial number is XX931XXX that means it was produced in 2009 in week 31. Thus, it’s safe to flash it with the iPad baseband. If you’re already encounted with the errors above, consider replacing your baseband chip.
You can use this website to check your iPhone’s production year and week based on its serial number.
If you intend to unlock your iPhone by flashing it with an iPad baseband, please check your serial number first!
So which year production and week number is your iPhone 3GS?