I thought that was weird so I checked the account on my computer and I had received several messages. Just to make sure, I went back to my computer and I logged into my yahoo account just fine. This is my first smartphone and I just upgraded from a feature phone.
If your email provider requires your account to use port 25, then you can only send email when you’re connected to your email provider’s network.
If you are concerned about battery usage, you may want to limit how often your i Phone checks for new email.
By default, your i Phone Mail app is set to "Push," which means it connects to download new email as soon as any arrives on the server.
When you set up your email account on your device, i OS automatically uses the correct account settings for many email providers.
To make sure that your account settings are correct, compare the settings in the Mail app to the settings for your email account: If you have a POP3 email account, then you can only check email on one device at a time.