cannot see message content on I phone mail

Suddenly the message portion of emails do not show up on my I phone. I do see the preview portion of the message when in the Inbox pane. But when I select the message When I access from my computer the message exists. Am using a 16 gig I phone, Not an S model. I recently downloaded one piece of music from itunes store and upgraded two apps but don't remember for sure the names of the apps.

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