Phone as Locator

[AC Question]

A friend with dementia wandered off and died as a result of exposure.
Is there a phone which could have been used as a locator, assuming he carried it. I would want one which was cheap, with a week long battery life, and a good locator. It would not be used as a satnav, music player, or even as a phone.

 

[Brian W1]

Not sure what would have a week long battery unless it was never used, but iPhone has find my friends app that will do what you want. It of course isn't that cheap but used would be close.