How do I find out my Tmobile phone number?

HowardHardin wrote:

I have a chromebook with mobile internet service, and have had it about a month. I have my account number, but to be able to access my account online, or even pay my bill I have to be able to input a Tmobile phone number, and I have not been given one! I tried calling customer service more than once and they are not helpful at all!

Have you already established an online account?  If so, you should be able to login using your email address that you used when opening the account.

If the online account has not been created, you may have the same problem as the T-Mobile Home Internet customers.  The following thread may help: