My Emails Are not Coming Through When outside the home

[AC Question]

Hi,
I have recently brought a HTC ONE but I'm having issues with my emails. I have linked my Hotmail account to my phone and I receive emails when I'm at home and connected to my talk talk wifi but when I'm out and about I don't get them.
I have activated the mobile media, and selected roaming data but it still does not seem to work.

Does anyone have any advice on what I should do or if I've missed anything on the set up?

 

[B. Diddy]

Welcome to Android Central! What wireless service are you using? Are you sure you have a data plan?