Are there hands-free devices with a forgotten phone alert?

Question

Do it yourself

My wife constantly forgets her mobile phone at home, so I want to put such a Hands-Free system in the car so that when the ignition is turned on, it checks for a phone with Bluetooth and issues a voice warning. The functions of a switchable immobilizer, transferring a photo of a person driving to MMS or via the Internet, enabling GPS coordinate tracking are also interesting.
Are there ready-made solutions or, maybe, someone did this himself?

Answer 1

I saw only some kind of device on the hand, which starts to squeak / vibrate when the connection is lost

Answer 2

Isn't it easier to use the status of her husband to make her not forget her cell phone?