Download only partial text in email
If you move frequently between a Wi-Fi coverage area or cellular coverage area, or if you're roaming, you can control how
much content in your email messages is downloaded while in a specific area of coverage. For example, when roaming, you
might choose to download just the subject of messages. While in an area of Wi-Fi coverage, you might choose to download
On the home screen, swipe down from the top of the screen.
Settings > Accounts.
Tap an account.
In the Roaming Data Control, the Cellular Data Control, or the Wi-Fi Data Control drop-down lists, select an option.
If you're in an area of coverage where downloading is restricted, you can choose to download the full email by tapping
Message truncated, download more. Additional charges might apply.