Failure

My first cell phone service provider was Verizon [age: 16].
Gave 'em the bird 'cause that was the word.

Then Sprint provided another mistake in my life [age: 17].

[age 18:] Enter T-Mobile.

5yrs w/o ANY problems or disgruntled calls to the reps.

Enter October.

Safe to ask: AT&T, what's the word?