Direct-to-cell technology mounts LTE base stations on LEO satellites at 340-570 km altitude using phased array antennas for narrow quasi-earth-fixed beams, enabling legacy devices to connect without hardware or software changes as spectrum sharing or MSS band overlays compensate for Doppler shift and round-trip time on the network side (https://content.knowledgehub.wiley.com/direct-to-cell-technology-enabling-satellite-connectivity-for-legacy-devices/). 3GPP Release 17 standardized initial NTN integration while the FCC SCS framework authorizes terrestrial-satellite spectrum reuse, supporting initial services such as text, location, and basic data. DTC functions as an interim layer ahead of NR-NTN maturity. This deployment pattern directly bypasses terrestrial tower density constraints in maritime, remote, and disaster zones, creating an orbital cell overlay that reuses existing mobile spectrum allocations rather than requiring new device ecosystems. Regulatory precedents in the FCC SCS order and 3GPP TS 38.300 extensions establish the technical parameters for Doppler compensation and timing advance handled at the satellite, yet coverage analyses have not quantified the resulting reduction in required ground infrastructure density. Long-term integration under 6G unified 3D architectures will incorporate airborne nodes, shifting connectivity economics away from terrestrial capex toward shared orbital assets.