Galaxy Y duos 3G Problem

[galauy]

I bought this phone about a week ago. and I just realized I couldn't get the 3G signals.
I've tried *#*#4636#*#* and set into WCDMA only and I just get no signal in my phone. and when I searched the 3G network manually on setting network it shows "your simcard does not allow a connection to this network".
I've flashed into the stockrom via odin, but still no luck. factory reset still no luck.
SIM works great on GSM or WCDMA in ANOTHER PHONE.
What's wrong with my galaxy Y duos?
Anyone please help me??

Any comments would be much appreciated. Thanks in advance

 

[phoenix_]

I'm having EXACTLY the same problem with my Galaxy Y duos from a month. I think thats a hardware issue.
If you have found the solution, please share it...