T-Mobile's Android-specific APN?

In speaking with a T-Mobile data support, I was told the following:

"We have several APNs depending on device, Android phones are provisioned with an Android-specific APN."

I know the following APNs are used:

epc.tmobile.com - used on every device, including Blackberry, NAT-based, not externally addressable. It is also provisioned for BBs in case the SIM is inserted into a non-BB phone.

BB-specific APN (don't remember the URL)

internet2.voicestream.com - used on "smartphones", presuming to be mostly Windows Mobile phones. Still NAT-based.

internet3.voicestream.com - provisioned for VPN customers, externally addressable.

---

Questions, presuming the tech's statement was true:

1) What are the APNs provisioned on your Android device? I presume you have epc.tmobile.com, but is there another?

2) Does anyone know why Androids use a different APN than WM devices?

3) How is this APN different?

Thanks.