Turn on the device
Firstly, you need to charge up your iPhone’s battery as deleting emails in bulk usually uses up a lot of battery time. Then consider turn the device on to ensure it is running. Place your finder to slide the bar on the screen to ensure the device is unlocked. Once the device is turned on completely, it is now time to go to the main menu.
Enter the Calendars category
Find the settings icon on the main menu and click on it. Tap on the Mail>Contacts> Calendars and enter the account that contains all the calendar information.
Switch off the application
Move your finger to the switch that reads OFF.
Delete overlapping information
Select “Delete from my iPhone” button and the overlapping information will be removed.
Removing email in bulk
Tap your finger on Mail icon to enter your email inbox. The process will bring the contest of the email on the screen.
Now place your finger on the left hand side at the bottom of the screen and choose the option that will let you move to emails from one folder to the other.
Now from the drop down list, select the Trash folder to move all emails from your inbox to this folder. Repeat this step for every email you want to delete from your inbox.
At the top of iPhone email window, you should be able to find a button that says Mailboxes, which takes you to a listing of the various email accounts. Enter the listing called Trash on it. Tap on the Edit button and a button saying “Delete All” will pop up. Tap on this button and all emails in your account will be deleted.