iPhone XS A1920 (AT&T) Logic Board with Paired Face ID Sensors

Face ID sensors that are part of the earpiece speaker and front-facing camera assemblies are paired to the logic board in an iPhone XS. To retain Face ID functions a logic board must be replaced along with its paired components.

This logic board is "locked" to AT&T. If you wish to stay with your phone's original service provider you must replace the logic board with one locked to the same provider.