The arrival of the LTE/4G wireless standard in the United States, and
its adoption by the country's two largest super-carriers AT&T and
Verizon was supposed to open the door for true equipment
interoperability, allowing customers to take devices purchased from
one carrier to another. In the past, incompatible network standards
(GSM - AT&T and CDMA - Verizon Wireless) made device portability a
practical impossibility. The arrival of LTE could have changed
everything, with device manufacturers using chipsets that would allow
an iPad owner to switch from Verizon to AT&T without having to
purchase a brand new tablet.

Example: Imagine buying a television set from an
NBC station and finding out the only TV station
the set will receive is NBC. Limitation comes not
from technology but [from] wireless carriers and
equipment maker's specifications.

https://ecfsapi.fcc.gov/file/7021921827.pdf

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