Mail app on iPhone removing emails?

On my iPhone I use the mail app. But although my emails come onto it fine, they go within about 5 days. So it only shows my emails from like the past five days. The emails aren't deleted because if I open my account via safari they're all there. Is there a setting to change this? Because on my brothers iPad he's got emails from months ago but I can't see any difference in the settings. Any suggestions?

Added (1). It's already set to show 1000 messages. Each time I open mail it checks for mail and the oldest email on there will go

Go to settings- mail, contacts, calendars, change how many Emails you want to get. You're probably have it at 50 right now change it to 1, 000 or something more than 50.

Do you get a consistent amount of emails a day? If so you mane need to tell theiphoen to show mroe than the default 50 messages… Settings, general, mail contact calendars and then under the Mail area there's a setting to SHOW "50 recent messages" thats the default setting. You may need to bump that up.

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