Make stolen phones unusable, Met Police urges tech giants

> enforce measures rendering handsets effectively unusable

> When an iPhone user is not identified as being at a familiar location

> equipping police with new powers to search properties without a warrant where stolen goods have been electronically located

> facial recognition to cut the number of grabs on the capital's streets

This all means total surveillance. What could possible go wrong with this?

I was under the impression that Android did something like this upon factory reset (asking for previous PIN before you can set the phone up again). Is it effective?