Just over a year ago, I purchased a prepaid pre-activated SIM card on eBay
for a temporary situation where I could not afford to pay for a regular
post-pay account. The connection worked so well and reliably that I am still
using it - buying refill prepaid cards from 7-11s and other stores.

Question is: Can I "register" this phone number with T-Mobile officially?
Since I never bought the service from T-Mobile officially, they obviously
have no records of me or the number I am using.

I wanted to do this because it might ease my transition to a standard plan
which I intend to start this summer. Also, "My T-Mobile" is now available
for prepaid services and seems convenient to use.

I did call T-mobile a year ago just to make sure the number is not stolen or
something, before I used the SIM card though. It was not, but I noticed that
I could not buy refill cards directly from them online, as it said the
number was not registered or something.

Regards and thanks for any insight.

JP
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