Unless you are mandated to have it because of your job I'm not sure why anyone would have the app on their phone.
My girlfriend got pinged last month a week after the contact, which would have only been on the bus to and from work or when she picked up lunch. I didn't know the rules had changed re double jabs, so I told her to delete the app off her phone and ignore it.
She didn't need anymore time off work sick (already had some days off because of post vaccine sickness) and it would spoil the rest of our weekend.
I'm not an antivaxxer or denier and have worn the mask even when not obligated to but there is no point in this silly pinging bollocks.