47 CFR 27.16 (e) (e) Handset locking prohibited. No licensee may disable features on handsets it provides to customers, to the extent such features are compliant with the licensee's standards pursuant to paragraph (b)of this section, nor configure handsets it provides to prohibit use of such handsets on other providers' networks.
(b) Use of devices and applications. Licensees offering service on spectrum subject to this section shall not deny, limit, or restrict the ability of their customers to use the devices and applications of their choice on the licensee's C Block network, except: (1) Insofar as such use would not be compliant with published technical standards reasonably necessary for the management or protection of the licensee's network, or (2) As required to comply with statute or applicable government regulation.