Siemens sx56 unlock to use with uk vodafone

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Hi
I'm new to this and would appreciate any help with the best way to unlock my at&t sx56 so I can use it with vodafone uk.
Rom version: A.20.17 ENG
Rom date: 15/5/03
Radio version A. 20. 10

Any help would be appreciated as i am a complete beginner.
Thanks
Spikeybhoy.
:roll:

You can only use SX56 on a 900 or 1900 network. If vodafone uses 900/1800 you should be able to use it. If it uses only 1800, then you can use the bandswitch tool by xda-developers or go into the bootloader to change the band to 900/1800. But I doubt if you will get good result.

easy way to remove a sim lock is to get the serial cable and use the xda unlock tool from this site

code simlock

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please sim code for imei 350314001384693 siemens sx56
from colombia sur america

hello i bought a 6315 on ebay, i want to use it in latin america, gsm 1900, i need to unlcok it, room version is A.20.10 i wanted to download the special rom, but the link doesnt work and room folder on ftp is emty, i know is an old phone,can someone help me please unlock it? ventasfeliptronics@hotmail.com