Default Applications
If you have multiple applications of the same type, such as email apps, you can select one app to be the default.
You can also use a simpler Home screen which provides an easier user experience for
1.From a Home screen, tap 
Apps >
Settings > GENERAL > Default applications.
2.Here you can view your defaults.
3.To clear defaults you have set up, tap CLEAR.
Settings | 101 | Default Applications |
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