Ask HN: Remote Monitoring for iPhone

Hi

I am trying to build an iPhone app which has a remote monitoring feature, more like a Parental control app, but more focused on the enterprise use of it. I did find some popular one like PhoneSheriff that does remote monitoring (text messages, app usage, etc..) without jailbreaking. I am a beginner when it comes to app development and then turned to HN to clear my doubts about this.

1. How does an app can access the data on other app? Isn't that prohibited, unless the app is designed to provide access to certain data stored locally?

2. Are there any packet sniffer for iOS or any API which lets you capture the RX/TX data.

Thanks,