[Q] need help please

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http://forum.xda-developers.com – hi guys i am back at it again i have a china android model number G15 android version 4.0.3 baseband version maui.11amd.w11.37.sp.v16, 2012/05/11 17:01 kernel version build number alps.gb.fdd2.mp.v4.5 now the phone works ok for 1 minor problem each time i insert a sim card the phone would detect it but i cant get any signal bars no signal and even if i try to dial it says network not available i contacted the company i bought it from and they sent me the G15 stock firmware i installed it with the flash tool but same problem no signal can anyone help me please i can u (HowTos)