That's a real letdown you're having this kind of trouble with the service, but we're here to help. A lot of what you're experiencing could be coming from your reception. How many bars of signal do you have? Do you have a solid connection or does it fluctuate? Is this a T-Mobile branded phone or did you get it from another vendor? I suggest double checking the APN settings then giving the phone a restart before you test out the services.
Although I appreciate your input, your suggestion about signal is completely unrelated. For example, I registered with my desktop PC. I still reached customer service successfully, but they found my number server side and saw its bugged. Everything is server side, unrelated to my connection bars.
PS - this site is horribly broken on the mobile site. For such a giant company, my experience both on this forum and starting up feels like a high school garage startup. I still haven't fixed my issues and waiting on engineers to get back to me. I bet AT&T wouldnt make me wait this long and actually spend a budget on a proper mobile site.
After you spoke with customer service, what happened? Were you able to get the issue resolved or was a ticket filed when you were done troubleshooting?
Sorry to hear you're having issue with the site on mobile. Can you describe what's happening exactly in more detail?