I still have doubts whether doing anything with Phone.apk and TelephonyProvider.apk is really necessary. I've been fiddling with these on some previous firmware versions and noticed that even though phone related stuff is listed as if it were causing a lot of battery drainage, disabling these services does not have any significant impact on battery life. Then again, I may be wrong. Perhaps it is firmware dependent.
At the moment I'm running 1.7.0. As long as I keep wifi off, the battery goes down quite slowly - I did however turn airplane mode on and mobile data off figuring they might be a factor.
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