I'm not sure but I went to WPSAntennas. This PDF site there gives valuable info about accessing field test modes. Although the site didn't mention your particular phone, I'd try the *#9324# and see what happens; Sometimes, our GSM carriers block out Field test modes on certain models:O I was in a similar boat with my Samsung SCH A930 on VZW; I tried one of their suggestions and it worked. I hope this helps.
Thank you for the link Quint101, I tried the V550 series code on my V635 and it worked, now to figure out the different items listed. Here at work I am between -65 to -70db. I know this link was listed before, but I don't remember them having this one listed. Something new to play with
I know its an old topic, but if you still want it, try *#8999*8378# That is test mode on the X497. It doesn't show much--everything is split into other codes that aren't very descriptive.
