Hi, on 3 branded devices (Nokia,SE etc) you can't change the band mode. This modification is built in to the hardware to prevent using 2G (GSM) network whom 3 have to pay "roaming" charges. The only way to use GSM mode is to modify the hware. Forum rules doesn't support hacking etc so can't help you here...
SOURCE: I have N95 8GB
To be abble use GSM mode you need to change your product code and get rid of 3firmware,which void your warranty and you wont be abble acces certain services (Planet 3) . You'll need programm called NSS to change your Product code.
First download and install Pheonix from this link. Nokia Phoenix Service Software 2011 - Download secondly Download flash file from this link Rm 578 file/Rm 579 file(There are two types in this phone,just select what is written on your phone) and install it to C / program files/pheonix.. after finished this installation open pheonix . Inside the interface at the> top left <there you see "File" click there and choose "open file" and then select the approprait Product type i.e "which is written on the back panel inside the battery of every Nokia(Type RM-000).After doing this again at the left top count from "File"1..2..3..the 4th one is "Flashing" press there, when you click there you'll see three sub-menus, just select the "Firmware Update" again you'll see another interface. Look at the product code there should be blank and put your "mouse tool" at the straight end from the "Product Code" there is a Button and choose the code which is written in the back side of your phone. e.g CODE:0000000.if the same code does not found just take one which is higher. After this you can see "Dead phone USB flashing" click that box. Now this is the last stage... Connect your phone with the USB to your PC and let the driver install ...wait for a moment.(If your phone working).Lastly after just finished (In case your phone is Dead, unable to switch on in normal mode start from here) Connect the phone to pc without powering...insert good battery and Click the "Referbish" button after this, a message will prompt you "press power botton" etc. insert charger or press it and wait until the phone will Restart automatically in normal mode 10-15 minutes. If you cannot understand just leave a Comment / Click here1. thanks for visiting fixya. Good luck.
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