US Mobile sim active but will not connect
 

This is my 3rd S4, and the first with Audi Connect.
I just picked up a 2013 Prestige Estoril Blue with Sport Diff, Nappa leather and 19" rims and tires. 29,000 miles, still under Audi warranty and I purchased a total exclusionary warranty for 100,000 miles/72 months after purchase.

I picked up a US Mobile SIM and activated it with 1GB/mo. Too much, I know... I cleared the fields out and loaded "apn" into the MMI.

The system has sent and received minor amounts of data (KB). When I select the Google maps or Audi Connect, the system hangs and times out.

The Connection status shows good to Very Good.

Any insights? Do I need to get the dealer to update the modem? US Mobile said they would call me back with support, but they have not yet.

You're not connected to the internet.
The connection settings for US Mobile should be:

APN: pwg
User name: enter a blank space
PW: leave blank

Thank you snagitseven - I actually had it as "png". I switched it to "pwg" and had instant success!

Quickest solve EVAR

It's always nice when it's a simple thing that solves a problem.