Galaxy S 3G very weak after changing ROM - General Questions and Answers

Hi, i have a Galaxy S, model GT-I9000, firmware FROYO 2.2, baseband I9000XXJP3, kernel 2.6.32.9 and compilation number xwjpf.
Since i remove the netlock, and change the ROM i can´t get 3G signal to make a phone call. My mobile operator is TMN from Portugal but i'll tried already with Vodafone also from Portugal.
The problem is the same.
Can anyone help me please.

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