[sidpatil]

Embedded SIMs won't be an insurmountable problem as long as the TV can work without network connectivity, but they'll be very inconvenient to deal with.

A destructive approach would involve desoldering the chip or unplugging the antenna. A nondestructive approach would involve Faraday-caging the television: a mesh or aluminum foil taped around where the antenna resides.

[myrandomcomment]

The issue can be solved by not buying a TV with a SIM (hopefully still a choice).