I'm getting a PDP authentication failure message and cannot connect over 3G. Help?!

A few days ago I suddenly started getting an error message when trying to connect to the internet over 3G.  "Could not activate cellular data network. PDP authentication failure" 
I am in Germany, on Telekom.  Have called Telekom customer service and went to the Telekom retail store.  Neither could figure out the problem and advised I do a factory restore on the iphone via iTunes.  I did that and am still getting the error message. 
The only weird thing that happened before the error started showing up is I had called Telekom the night before to add a U.S. data roaming package to my phone plan for an upcoming stateside trip.  They told me to text "W2S" to 7277 in order to add the U.S. data roaming plan.  I did that, and the next morning this error started popping up.  Don't know if that is related or coincidence. 
I am traveling to the states in a few days and would really like to get this cleared up.  The only option Telekom has left for me is to mail my phone in to Apple.  :-( 

If I may ask, what country are you from?
To note, what you see is just not possible from a radio communication level, you're the first I've ever seen with this problem. (see photo and footnote below)
Since you said the Carrier option is available, can you go to it, turn off automatic and see what networks show? Normally it you will see At&t and T-mobile, however, if you see Sprint,  you will need to go talk to Apple.
But if T-mobile does show, select it and see if your phone connects.
If not, remove the SIM card reboot the phone and try again.
I'm sorry about not being clear about the phone number,  while connected to the Verizon network, is the phone number showing your T-mobile one or is it something different?
For reference,
Normally, what you will see in the status bar when on the Verizon network when not on 3G/LTE is the 1X symbol.
GPRS is a completely different communication type from 1X and Verizon doesn't support it. If you visit a Verizon store (or T-mobile) the staff will probably be surprised and confused about what your phone is showing.

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