My iphone will not pull up any of my emails or send an email

If iPhone is unable to send or receive mails, try these basic troubleshooting steps.

1. In Settings, turn on other SMTP servers

1. Tap Settings > Mail, Contacts, Calendars and under Accounts, tap the account from which you're trying to send mail:
2. Scroll down to where it says Outgoing Mail Server and tap the box where it says SMTP:
3. Scroll down to where it says AT&T SMTP Server, and tap it turn it on.
or
Turn on all other SMTP Servers.
2. Add your email account on iPhone instead of syncing your mail settings from your computer
1. Tap Settings > Mail, Contacts, Calendars and under accounts, tap Add Account.
2. Follow the instructions. When you enter your email address, iPhone will look up your service provider's settings for you. If iPhone can't find your service provider's settings.

3. Turn iPhone off and then on by pressing and holding the Sleep/Wake button for a few seconds until the red slider appears, then drag the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
To turn iPhone on press and hold the Sleep/Wake button until the Apple logo appears.

4. In Settings, turn off Wi-Fi to only use the cellular data network

1. Tap Settings > Wi-Fi and turn off Wi-Fi.
2. From the Home screen tap Mail.