IOS – Cancel accidental Siri activation

There isn't a lot you can do about holding it up to your wife's head, perhaps it isn't close enough. You will notice that if you try to fool the phone by holding it up to your had or arm siri will not activate.

As for the geofenced reminders, you need to have location services turned on for reminders.

You will also need to set the address in your contacts, so add your home and work address to your contact.

For troubleshooting you will really need to look into the apps you are trying to control from Siri, as Siri itself is not an app, it is part of iOS. It is each individual app that will need to be looked at when troubleshooting.

Remember that Siri is still in beta and you can expect some teething problems with it.

The iPhone uses assisted GPS to improve the accuracy of the location system using GPS and cell towers. Wi-Fi networks are used to help determine the device's location; this is called a hybrid positioning system (XPS).

Prior to iOS 4 iOS tapped into the Skyhook Wireless database of Wi-Fi hotspots and their locations. Apple disclosed in April 2010 that they had switched over to their own proprietary database.

If Location Services is on, your device will periodically send the geo-tagged locations of nearby Wi-Fi hotspots and cell towers in an anonymous and encrypted form to Apple, to augment the crowd-sourced database of Wi-Fi hotspot and cell tower locations. In addition, if you are traveling (for example, in a car) and Location Services is on, a GPS-enabled iOS device will also periodically send GPS locations and travel speed information in an anonymous and encrypted form to Apple, to be used for building up a crowd-sourced road traffic database. The crowd-sourced location data gathered by Apple does not personally identify you.

For your security concerns, read this Apple press release.