I don't ever go outside the US, however, I do travel between areas that have 4G and areas that are still on 3G. There are three choices under "Preferred Network Mode"; 1) Global; 2) LTE/CDMA; and 3) GSM/UMTS. My question is this: I don't need Global so it is currently on LTE/CDMA. Is doing that wasting battery power searching for additional signals, or should I switch it back to global as it was the default setting? Thanks!