n gage only 900 mhz network

[atree]

My N Gage Qd Was Working Ok With 1800 Mhz Network But Aftre Bat Low The Mobile Goes Off And After Charge The Mobile The 1800 Mhz Netwok Has Gone. Now It Working Only With 900 Mhz.
I Have Changed The Antenna Swicth , Full Flash Phone, And Also Write The Pm But The Problem Is Still Same.

Can Anyone Help Me.........

[Cool_74]

My N Gage Qd Was Working Ok With 1800 Mhz Network But Aftre Bat Low The Mobile Goes Off And After Charge The Mobile The 1800 Mhz Netwok Has Gone. Now It Working Only With 900 Mhz.
I Have Changed The Antenna Swicth , Full Flash Phone, And Also Write The Pm But The Problem Is Still Same.

Can Anyone Help Me.........

Try to replace the band pass filter closed to mjoelner, there are two of them i'm not sure which one for 1800Mhz, so you just give it a try between two BPF. Good Luck

Best Regards

Cool_74