Its about time SMS TAC needs to go. If your phone does not support it (i'm guessing you are using a non-smartphone?) then its about time you upgrade it. Many scams come out from SMS TAC as the SMS can be easily replicated.

But sometimes i get confused between M2U and MAE as it overlap between each other. Sometimes the verification comes thru the former, and some the latter. Relinquishing SMS TAC is fine but the system should be refined more.