Looks like others have had complications with the apn for simple:

Try changing the apn to:
Name: simpleweb
• Access Point (APN):simple
• Connection Type: http
• User Name: <none>
• Password: <none>

If you need to add it, it's port 80 and proxy 0.0.0.0.

Try those settings and then see if you can get a webpage. FWIW, I can't get a browser page if I'm on the wrong apn, despite seeing a strong signal. (though actually a strong signal here is unusual!)