Did you end up with an unwanted keyboard when we were exploring settings on Friday? Here's how to "unselect" that keyboard. I really don't have much need to type in Greek!
Go to Settings>General>Keyboards and touch International Keyboards. You can now see Keyboards with a number in the right column. This shows the number of keyboards you have inlcuding your default keyboard which should be English. Now touch Keyboards. You will see your keyboards listed. Touch EDIT in the upper right corner. You will see a red circle with a minus sign to the left of all but your default keyboard. Touch the red circle to delete a keyboard, then touch DONE in the upper right.