Hmm, that's super strange. Should be pretty easy to find that number. Usually the SIM comes in a larger piece of plastic shaped like a credit card. The number should be on it. Do you still have the piece that the SIM came out of?
Yes, I examined packaging which was not a simple card but rather a packet that expands when you pull on one side. Then a section that has a place for the SIM card (and I assume it"s holder) extends from the other side. All that I have is a hole in that section where the SIM card and (I assume) its carrier were positioned. The T-MOB agent removed the SIM and installed it one of our previous phone leaving me with the packaging. The new phone which we purchased had a SIM card installed. THE QUESTION IS: Once the SIM is in the phones, is there any way of determining its number? If it is removed, is its number on the SIM card?
Also note added question on original inquiry about mystery number assigned (for what purpose?).