//! # 3GPP: Mobile telecommunication protocols
//!
//! Protocols standardized by the [3rd Generation Partnership Project (3GPP)][3gpp],
//! covering cellular networks from GSM to 5G.
//!
//! [3gpp]: https://www.3gpp.org/
//!
//! ## Status
//!
//! **Planned** — Module placeholder. Implementation coming in 0.1.x–0.5.x for:
//!
//! - **2G/3G**: GSM, GPRS, UMTS, HSPA
//! - **4G LTE**: S1AP, NAS, RRC, PDCP, RLC, MAC, GTP, Diameter
//! - **5G NR**: NGAP, NAS-5G, RRC-5G, PFCP, HTTP/2 for 5GC