You tried restarting your phone? I changed plan and failed to connect to the internet until i restarted my phone.
Sometimes I'm quite disappoint with my mobile data plan... slow, waited quite long to access a webpage.
yeappp. same goes to me. the internet is so slow.
May I know where is your location?
Hope can try to find out for you if the location is provided.
Telco network is all depending on how many users are sharing same site, and the distance from the site.