A good rule of thumb is that if something involves secretly tinkering with somebody else's phone, it's not the cleanest move.
A guy wrote into "Am I The A**hole?" about how he was frustrated with his wife checking her email while they were on vacation. Rather than talk to her about it, he picked up her phone while she wasn't looking, and changed the notification settings. He also took the opportunity to criticize her job as not worth caring about.
She is hourly, and not paid a high enough wage to warrant her needing to check emails after hours. I'm paid a high salary in a 24/7 production type job. I check my email once a day to make sure I didn't seriously screw the pooch on something before I left, but that's it.