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Access the iPhone's Field Test mode
Authored by: heavyboots on Feb 04, '10 08:44:19PM

On the 3GS, the signal strength "bars" area turns into an actual number when you enter Field Test mode. I believe this is the signal strength to the tower you are currently connected to. What is odd is that on T-Mobile, I can't see an Rx Quality value for the GSM Serving Tower, but this is probably either a product of the jailbreaking or the fact that TMobile's 3G network is inaccessible as it is on a different frequency from AT&T's.

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