Why don't email alerts show on my iPhone?

I just set up my phone yesterday do I'm new to it. Basically I logged into my Gmail account on the Mail app but for some reason new emails only appear when I go into the app and refresh the page manually. My mum has an iPod touch so I know that you can get them. I went into settings > notifications > mail and changed it so that the alerts should appear but they don't… It's an iPhone 4S if that helps.

It's called push notifications. Try that

I never had this problom on my iPhone.
go to your local AT&T, Sprint, T-mobile, Verizon etc etc

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