Hi iMACDaddy2009,
When you state you need to refresh your incoming mail manually, it really sounds like your fetch mail settting is either off or set longer than you'd like.
Learn about cellular data settings and usage on your iPhone and iPad (Cellular Model) - Apple Support
You can set apps like Mail to fetch data wirelessly at specific intervals. The more frequently your device fetches email or other data, the faster data is consumed.
- To fetch new data manually, tap Settings > Mail, Contacts, Calendars > Fetch New Data. Turn off Push, then tap Manually.
- To increase the fetch interval, tap Settings > Mail, Contacts, Calendars > Fetch New Data and tap Hourly.
This is a global setting, which means it applies to all apps that don't support push services.
Please verify that setting.
Best,
Nubz