AST SpaceMobile is getting attention for its defense applications since their satellites can connect directly to standard mobile phones without special equipment. This is useful for troops and first responders in areas where ground networks fail, and they have secured multiple government contracts for it. The stock is up almost 300% in the last year, but the valuation is high with a price-to-sales ratio over 122. Also, earnings estimates for 2025 and 2026 have been revised down recently. Competitors like Globalstar and Viasat are also actively upgrading their networks.