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Not sure if this is legit
Authored by: lullabud on Mar 01, '11 10:45:24AM

I just tested my iPhone on both 3G and E and they both had the same length and amplitude DTMF tones, which makes sense. There's no reason to have those differ just because you're on a different radio technology.

I tested on an unmodified 4G iPhone v4.2.1



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Not sure if this is legit
Authored by: fbitterlich on Mar 11, '11 05:16:15AM

Same test results on a 3GS w/ 4.2.1. No difference in tone length.

I would have been really surprised if 3G or not makes any difference in the length of the DTMF tones generated. That really has nothing to do with it.



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