How to Delete Default Apps on iPhone, iPad in iOS
You can now delete defaults apps from any iPhone, iPad, or iPod touch running modern iOS releases. Yes this means you can delete Mail, delete Music, Stocks, Maps, Calendar, Watch, iTunes Store, Compass, Reminders, Videos, iBooks, Podcasts, Find Friends, Watch, Tips, Voice Memos, News, Activity, and any other of the pre bundled default iOS apps that arrive on iPhone and iPad, all of them can be removed easily.