[Q] tmobile 2.2.2 stock rom to orange 2.3.4 uk full sbf

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hi all this may sound like a stupid question but i would like to update rom to full sbf orange uk 2.3.4 is the only one i seem to find as a stock rom im on t mobile 2.2.2 stock rom will i stil be able to use my tmobile sim thanks

Of course you can.