Do you really believe your mobile phone software when it says you have switched off wifi & gps?
WiFi and GPS on, battery lasts a day or two at best. WiFi and GPS off, battery lasts six or seven. Mobile data off too can easily stretch that to 8 or 9 days, and 10 is not impossible.
Not that there aren't other ways to track you, but sometimes you can be a teensy bit too paranoid.