I already found a hook to get into the call settings, and today I found a way to get the emulator into the Airplane Mode, when all network communication is disabled. The emulator switched to airplane mode, then to network searching mode and then finally to the normal mode when a cellular network (emulated, of course) is available. Currently, there is no way to trigger the Airplane Mode in the emulator, although it might be necessary for general testing (e.g. in order to completely disable network access).