Would there be a problem with doing two (or more) calls in series and just adding up the time of each call? I would be impressed if the battery survived through two near four hour calls. Just be sure to start the second call shortly after the first one finishes.
> > On Tue, May 27, 2008 5:27 am, ian douglas wrote: >> ian douglas wrote: >> >> Since the call ended about the same amount of time as my test last night >> (236 minutes vs 234 minutes), I'm curious if either AT&T or TMobile >> simply kill a phone call just shy of 4 hours of talk time to free up >> their network. > > That sounds likely. > > With GSM the cost of a call is only calculated once the call completes, if > there is no limit on the length of call, someone who steals a GSM phone, > can keep a call going for several days, and the network only finds out > when they hang up. If the call is to an expensive international > destination ($2 per minute) The cost to the network could be high. Because > of this most networks limit the length of calls. > > The details of the scam are described in chapter 17 of "Security > Engineering" by Ross Anderson. You can download a PDF copy from this page: > > http://www.cl.cam.ac.uk/~rja14/book.html > > Back to your test, As far as I know there is no limit on the length of > calls from landlines, so one solution would be to call the Freerunner from > an landline. > > The other option would be to do what phone manufacturers do, which is to > measure the current drain from the battery, and calculate the talk time > from the battery capacity. Don't forget to be unreasonably optimistic > about signal strength, and battery life. :-) > > -- > David Pottage > > Error compiling committee.c To many arguments to function. > > > _______________________________________________ > Openmoko community mailing list > [email protected] > http://lists.openmoko.org/mailman/listinfo/community > _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
