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Phone signal bars , 3g Icon.

Talked with Htc tech online and he said the reason for the low bars and 3G icon not being on all the time is because when you are not making a call or using data the phone goes into a power saving mode and the display doesn't show the signal power or data . But if you are online or using data the 3G icon lights up and if you are on a phone call the true signal strength will show in the bars. Check it the next time you make a call.