The early termination fee applies to new customers joining the T-Mobile network, while existing subscribers of Deutsche Telekom AG
Google was responding to an inquiry by the Federal Communications Commission, which in January had sent letters to Google and wireless companies as part of the agency's broader consumer protection inquiry.
In January, the FCC asked Google, Sprint Nextel Corp
The FCC said in letters to the companies that since there is no industry standard for early termination fees, consumers must be able to understand what they are signing up for when they choose a service plan with such a fee.
U.S. service providers typically require customers to sign 2-year service contracts in exchange for a discount on handset prices. Since carriers pay for part of the cost of the phone the fee is their way of recouping that amount if customers leave before paying for two years of service.
The FCC had kicked off an investigation into such fees late last year after Verizon Wireless, the biggest U.S. mobile service, caused an uproar by doubling its fees for smartphone users who bow out of their service contracts early.
In December Verizon sent a letter to the FCC defending doubling fees to $350 linked to some smartphones. In Tuesday's letter, Verizon Wireless said it has reduced the number of devices that are subject to the $350 fee.
(Reporting by John Poirier; Editing by Richard Chang)