T-Mobile has a pretty handy gift for those of you who are wondering what to get your geeky friend this Christmas without breaking the bank – where it comes in the form of the T-Mobile SIM card adapter. After all, SIM cards don’t just come in one size these days, as we have the microSIM to contend with, and it is a good thing the T-Mobile SIM card adapter costs a mere $4.99, making it quite a steal especially if you need to switch from one phone to another from time to time. No idea on just how widespread the T-Mobile SIM card adapter’s availability is at this point in time, so you might want to head down to your nearest T-Mobile retail store to check out whether there is some stock on hand.