Yes, i did troubleshot APN settings with technical support.
Yes, i did try different versions of APN and yes, i did try different version IPv4 instead of IPv6. still no matter version or what APN server i try-always redirects to u.web2go.com/upsell
No luck, i did submit two technical support tickets-one for Nexus One, one for Nexus 5. i did finally found a technical support t-mobile representative that did confirm that both phones are compatible with my data plan, which previously was denied by t-mobile representatives...
I was promised a resolution of 24-72hrs and callback on Wednesday, so far-today is Tuesday and phones are still offline/redirected to u.web2go.com.