Hi all

Just asking for a little help.
I recently got a GS5 from my phone network back home in canada (bell). I unlocked it when I started school in the US and got a plan with AT&T. The only problem is my data is not working at all. The only way I can use anything that requires an Internet connection is if WIFI is connected. I went into the AT&T store and they where useless (big shocker I know). Is there anything I can do to fix this ?

Thanks for the help apriciate it

-Brett