The 7.39.

Did you see the BBC two part drama about an affair between two commuters on a train to their work.?
It was very good.I thought suspicous partners can use a tracker in their phones to see where they are ?

Yes you can get an Iphone app for tracking your partner/wifes phone but you would need her app password for that and need to be a rather sad individual to do so IMO

If my partner decided to track me I think he would find me in the solicitors office getting a divorce.

Imagine how much worse “Brief Encounter” would have been if Trevor Howard and Celia Johnson had carried smartphones. It’d have been over before he’d even got that grit out of her eye.