Phone won't access internet data
i'm on holiday in portland from australia, and so bought an at&t sim to be able to use my mobile while in america. the plan on my sim allowed for unlimited texts and calls, data, etc.
however, since setting up my new sim and plan, i can't get any internet access. the phone allows me to send and recieve texts and calls, and can connect to wifi, but can't access internet.
mobile data is on, and so is data roaming. when i try and connect to the at&t network it says it's unavailable (if that's of any relevance).
my phone is a samsung galaxy s4.
thanks for your help in advance.