Why will my latitude app not work on my phone or my husbands? we run the app using Location determined by wi-fi and or mobile networks. Have used this location on my phone since started maps/latitude and now it is like it does not locate me without wi-fi on.at&t says not there towers but I find it odd when I was out of my town and 32 miles in different town everything loaded just like it always did and   wi-fi was not on.Has there been an update that has changed something ? but if that happened then why can my children still use things the way we always have?Thank you