taobao has a lot of bugs and screws loose

Try to use one of your Chinese friend's numbers or have them assist you with it. After that, I'm sure you can change it from that number to your new one (since people get their phones stolen all the time, etc)

It's probably not Taobao that is rejecting your number it could be that you just put the number in wrong or misread the instructions. Try more than one number and just for a test if the other number doesn't work than it could be the system they are using at Taobao that is causing this. If the problem persists just try to contact someone that is in charge of that site and have them walk you through the process to get started.

your number is registered on your id card or passport if its not registered then i think you cant have access to taobao try that because i already suffer that thing

It is a very good and useful question for foreigners who want to use taobao,and pay online!

You need to go to china unicom or china Mobil to register with your passport first , then you can register in tao bao. In case , tao bao worker still say cannot register, then you have to tell china uni com or Mobil that you want to to use taobao. They can fix it .

I did contact taobao, and they helped me! Thanks guys

maybe because you're the wrng kind of foreigner 

I really want to know how you guys order stuff on taobao? I don't know chinese so it's really hard to master.