Help 3g problem please help

[pvndpk]

Hi all..I have problem in 3g connectivity..I have installed galaxo 1.6.3.3..
And i am from india..I am using bsnl 3g sim..But i am not getting 3g symbol
on signal bar..But if i put the same sim to n70 mobile i am getting 3g symbol..
please help..I also tried with indian firmware..same result..

 

[informale]

You have probably lost APN settings when flashing the phone. Check APN settings.

 

[cpim1]

You have probably lost APN settings when flashing the phone. Check APN settings.

Same type of symptom with me on my HTC Desire: suddenly no 3G icon, but still shows H icon and provides internet connectivity. I'm on 3 network in UK. An identical phione also on the 3 network does show the 3G icon and I have compared the APN settings in the "Settings" menu and they are identical to my phone.
Anyone have any idea why the 3G icon would have suddenly disapeared and what the implication may be?