How to delete a configuration profile on your iPhone
- If the app has a configuration profile, delete it.
- Go to Settings > General > Device Management, Profile Management, or Profile & Device Management, then tap on "boom! Red APN Settings" configuration profile.
- Then tap Delete Profile. If asked, enter your device passcode, then tap Delete.
- Restart your iPhone, iPad, or iPod touch. (https://support.apple.com/kb/HT201559)