AST SpaceMobile Enabled Indoor Satellite Cellular Calls
The company demonstrated its satellite network can overcome building penetration loss to support standard phone calls.
Updated on Sept. 25, 2026 in Telecommunications
Live Poll
Do you trust that satellite-based cellular connections will work reliably inside your home?
AST SpaceMobile has declared that its BlueBird satellite fleet will support indoor cellular calls by utilizing low-band operation. This announcement describes a capability for direct-to-device communication without requiring specialized hardware.
Why it matters
Reliable indoor connectivity has long been the primary barrier to satellite-to-phone adoption, as building materials significantly attenuate signal strength. AST SpaceMobile aims to overcome this link margin loss through specialized orbital architecture.
The system utilizes low-band spectrum, such as 700 MHz, which provides 9 dB less path loss than a 2 GHz link. Handsets operating at PC2 26 dBm provide 3 dB more power than standard 23 dBm devices to help close the link margin.
The players
AST SpaceMobile
A developer of space-based cellular broadband networks designed to provide direct-to-device connectivity using low-earth orbit satellites.
3GPP
The global industry organization that develops technical specifications for cellular telecommunications and the NR Non-Terrestrial Network stack.
The details
The system achieves coverage by balancing high uplink sensitivity with advanced beamforming techniques designed to penetrate urban blockage. By using low-band frequencies, the satellites improve signal diffraction and penetration through buildings and windows, effectively managing the path loss inherent in space-to-ground communications. The architecture builds on the NR Non-Terrestrial Network (NTN) stack developed by 3GPP to ensure compatibility with standard mobile hardware.
Timeline
The 3GPP developed the NR Non-Terrestrial Network stack over the last 6 years.
The Tech Race
This effort marks a critical move to standardize satellite-to-phone performance within the 3GPP Non-Terrestrial Network (NTN) framework. While competitors focus on initial outdoor text connectivity, AST SpaceMobile is accelerating toward the milestone of seamless indoor voice.
Users will eventually be able to place and receive cellular calls from indoors without requiring specialized satellite hardware or antennas. This capability will rely on standard mobile devices, though specific launch dates for commercial availability remain unannounced.
The takeaway
The ability to bypass signal-blocking building materials marks the next major technical hurdle for space-based cellular providers. Watch for upcoming satellite performance benchmarks that quantify indoor call success rates compared to terrestrial tower coverage.
Further reading
For more technical updates on direct-to-device satellite connectivity, visit Telecommunications.
Source note: This article includes information reported by Advanced-television.
Live Poll
Do you trust that satellite-based cellular connections will work reliably inside your home?
