They have good $400 Android phones from Chinese companies
Acquiring Nextel fucked them up.
It was antiquated technology and they gained nothing and had to push billions to get Nextel up to par and in line, in the mean time their own network suffered, they bypassed phones and they lost more ground to Verizon and AT&T.
It looked good on paper and they thought it got them a lot of business users, but it was terrible
When I had Nextel I never had a dropped call