The only way mine will click and stay is carrier logo on top facing the pad and the notched end inserted first. Leaving the chip towards the top of the slot and facing away from the . I did notice that the voice mail call in number is getting populated.
I tried to setup a APN with V24 but when creating a new or editing the existing one the APN disappeared entirely. even with a reload and cache wipe.
I have tried this SIM in Palm-Win mobile- Android and symbian phones. most of the smart phone had no data plan and were unbranded or unlocked. The SIM has been unlocked for years. I will assume the tablet isn't locked?
Have you tried this:
Settings->Wireless and Network Settings->Mobile Networks->Network Operators and see if it can find the T-Mobile Network ??