T-Mobile had informed the FCC of its own study which claimed that devices using the AWS-3 band proposed for the free channel would experience harmful interference from the nearby commercial AWS-1 band.
The mobile firm had contended that such interference could leave its paying customers unable to use their devices.
In response, the FCC conducted a series of tests which it said had not only replicated T-Mobile's reported conditions, but found instances in which worse interference was possible.
"The FCC has generally adopted standards that balance the risk of potential interference against a variety of other factors, including the impact those standards may have on the potential uses of spectrum," said the report.

