Endurance
Because of its 3,000 mAh battery, it is relatively easy for the G4 to last one day on a full charge. On average, we had a screen-on-time of around 5 hours. Even just over 30 hours on a single battery charge should still be feasible with less intensive use, but 1.5 days is really too high. This means that the G4 does meet the current minimum requirements, but it is not really generous.
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There is a power save mode that can be automatically enabled at 15% or 5% remaining battery level and apps in the background can be limited. Unfortunately, neither of these can be modified to suit the specific functionality. There is also a 'game optimizer'. This adjusts the video quality in games to save battery power.
Call quality
The interface of the phone application is a little bit refreshed and therefore up to date again. At the top there are five tabs for calls, call info, contacts, favorites and groups. Looking up a contact is easy by typing the first few letters of a name on the numeric keypad. If you change your mind at the last moment, it is also possible to open the message app from the dialer and set up an SMS.
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Conversation partners are generally easy to understand although the sound is rather shrill, especially when the volume is higher. We received a few complaints about a crackling and disruptive connection which made it difficult for us to understand ourselves. Noise reduction and better voice clarity can be enabled in the settings. Strangely enough, these are not already turned on by default.