Default What frequency band am i using?

I have an unlocked telus galaxy s3 that i enabled the wcdma 1700 frequency because i want to use it with T-Mobile but how can i tell which frequency the phone is currently using? I know about the dialer code *#2263# but this only allows me to select the frequency manually right? If automatic is selected, it doesn't tell me which frequency my phone is using right?

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