3 ms·
This happened on TDMA systems like on T-Mobile and AT&T. (Verizon & Spring were CDMA). There's a TDMA modulation frequency at 217Hz and this interferes with al
by mozumder 8y ago
This happened on TDMA systems like on T-Mobile and AT&T. (Verizon & Spring were CDMA).
There's a TDMA modulation frequency at 217Hz and this interferes with all sorts of nearby audio devices. CDMA and WCDMA phones have a much broader interference spectrum, which is why you don't hear it much anymore.