Cellular data not connecting to internet

I recently switched to boost mobile and nearly everything is working fine, I can make and receive calls and messages using my data, however I can't connect to the internet!
Everytime I open up safari I get the popup "can't activate cellular data network, you are not subscribed to a cellular data service"
We've tried using different sim cards and it has the same issue. However, when I reset my phone to factory settings it works perfectly fine.
I'm using an iphone 5s

Sorry