Hello Apple Developer Team, I am developing an iPhone application called RF Field Test for professional DAS (Distributed Antenna System) and macro cellular network technicians. The application already supports GPS location tracking, network connection detection, and cellular speed testing. To make it useful for professional RF field testing, I need access to real-time cellular measurements, including: PCI (Physical Cell Identity) Cell ID / ECI / NCI RSRP, RSRQ, and SINR LTE and NR frequency bands EARFCN and NR-ARFCN LTE / 5G NSA / 5G SA identification Channel bandwidth Serving and neighboring cell information I understand that standard public Core Telephony APIs do not expose most of these measurements. My questions are: Is there an officially supported API, entitlement, or carrier-specific development program that provides access to these measurements? Can an independent developer apply for this access, or must the application be developed through an authorized cellular carrier? Would Apple's interoperability request process be appropriate for requesting these capabilities? If these measurements are unavailable to third-party applications, is there an official recommended approach for developing professional cellular RF testing tools on iPhone? I am looking for a legitimate, App Store-compliant solution without private APIs or unsupported methods. Thank you for any guidance.