Set Up E-mail on an iPhone
The images used in this guide reflect the iOS 9.1 operating system.
Scroll down and select Mail, Contacts, Calendars.
Enter the Name you wish to display to others when sending an E-mail, your full E-mail Address and the Password for the E-mail account. The description will mirror the E-mail Address by default, although you may change it.
Ensure that IMAP is selected at the top and that the name, address and description have been carried over.
Scroll down and enter imap.1and1.co.uk in the Host Name field and your full E-mail Addressin the User Name field under the Incoming Mail Server section.
Click Save to complete the setup of your 1&1 Mail Basic on your iPhone.