IPhone Email Difficulties - POP and IMAP? - 1

I currently have 3 email accounts set up on my iPhone. The primary one has recently somehow changed itself from a IMAP account to a POP account. I can no longer access older emails, like I had been able to with my IMAP account. The other two emails have stayed IMAP accounts. Is there any way for me to change it back. I'm thinking that this may have been caused by me beginning to use the Mail app on my MacBook? Not sure, but any guidance would be greatly appreciated.

You should be able to change it by going to settings then mail on your iPhone. I don't think it has much to do with you checking on your Macbook. I have exchange accounts, gmail and pop accounts set up to work on both my iphone4 and MacBook pro. If you still need help after changing your settings I would contact your ISP for your mail account to make sure that everything else is correct or you may also contact me at easysmartphonesupport.com. I provide tech support for iPods, iPhones and iPads for only $10.00 which is less than Apple $29.00. You can also reach me by calling 1-888-506-4448 or email at TechHelp@easysmartphonesupport.com. Hope it is as easy as changing to an IMAP account but if not please feel free to contact me.