T-Mobile - Don't get people started ...
Customer service = No Service
Most CS operators fail to even manage to put you through when transferring a call - Usually they hang up on you.
Billing = When we want to bill you we will - in the mean time let me bill you for your normal monthly contract that you cancelled months ago
I left in early July, been told September for a final bill, just how hard is it to add 2 months line rental to a "cancelation fee" at the time of cancellation?
As said, Vodaphone FTW ... I moved after 3 years with T-Mobile and not regretted it since...