Thanks guys.
I've now got it set up.
The only problem is -- I have a text message from T-Mobile saying I'm about to run out of credit, and may encounter problems ... but I purchased the phone on contract.
I was able to check my email initially, but after reading this text, I can no longer use the internet.
Is this something that will be ironed out, say, in the next hour as it all gets settled down? Or will I need to get in touch with them again?