well thats an hr and half short almost to the "T"
and i went to htc, again, gsm must be a very power conservative network
397min for wcdma = 6.61hrs
445min for gsm = 7.41hrs
http://www.htc.com/us/product/htcfuz...ification.html
i guess i see where u got ur number from, but evidently gsm uses way less power to make calls