Master Cellular Networks.
From 2G to 5G.

The most comprehensive interactive 3GPP signalling simulator on the web. Watch real protocol message flows animate across authentic network topologies—covering every generation of mobile technology.

366 3GPP procedures · 4 network generations · 40+ network elements
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105
5G NR Procedures
95
4G LTE Procedures
98
3G UMTS Procedures
68
2G GSM Procedures

Four Generations, One Simulator

Every technology includes an interactive network topology, real-time message animations, and a full procedure browser organized by 3GPP specification sections.

5G NR

5G New Radio & 5G Core

Complete 5G NR coverage: RRC (TS 38.331), NAS 5GMM/5GSM (TS 24.501), NGAP, XnAP, F1AP, E1AP, PFCP, all 5GC SBI services, user plane protocols, IMS/VoNR, and location services.

105 procedures across 12 protocol categories
4G LTE

LTE & Evolved Packet Core

Full EPC signalling: RRC (TS 36.331), EMM/ESM (TS 24.301), S1AP, X2AP, GTPv2-C, diameter interfaces, VoLTE/IMS, user plane, and carrier aggregation procedures.

95 procedures across 11 protocol categories
3G UMTS

UMTS & UTRAN

UTRAN signalling: RRC (TS 25.331), GMM/SM/CC/SS (TS 24.008), RANAP, RNSAP, NBAP, Iu/Iub/Iur procedures, circuit-switched voice, packet-switched data, and HSPA.

98 procedures across 10 protocol categories
2G GSM

GSM & GPRS

GSM foundations: RR (TS 44.018), MM/CC/SS (TS 24.008), BSSMAP, DTAP, GPRS GMM/SM, SMS protocols, circuit-switched calls, and supplementary services.

68 procedures across 8 protocol categories

What You'll Learn

A sample of the 3GPP signalling procedures you can run, visualize, and study inside the simulator.

5G NR Highlights

  • RRC Setup & Registration
  • 5G-AKA Authentication
  • PDU Session Establishment
  • N2 Handover (NGAP)
  • Xn Dual Connectivity
  • Network Slice Selection (NSSF)
  • Service-Based NRF Discovery
  • VoNR Call Setup via IMS
  • NRPPa Positioning

4G LTE Highlights

  • Initial Attach & Default Bearer
  • EPS-AKA Authentication
  • S1 & X2 Handover
  • Dedicated Bearer Activation
  • VoLTE Call (IMS SIP)
  • Tracking Area Update
  • Service Request & Paging
  • Carrier Aggregation Config
  • eMBMS Broadcast

3G / 2G Highlights

  • UMTS RRC Connection Setup
  • UMTS SRNS Relocation
  • HSPA Channel Reconfiguration
  • Circuit-Switched Voice Call
  • GSM Location Area Update
  • GPRS Attach & PDP Context
  • GSM Handover (BSC→BSC)
  • SMS Delivery (MO & MT)
  • Supplementary Services (USSD)

How It Works

Get from sign-up to your first simulation in under a minute.

1

Create Your Account

Sign up free with your email. No credit card needed. Instant access to the full simulator.

2

Pick a Technology

Switch between 5G NR, 4G LTE, 3G UMTS, and 2G GSM. Each loads its own network topology and elements.

3

Run & Learn

Open the Procedure Browser, choose any 3GPP procedure, and watch the signalling messages animate in real time.

Built For

Whether you're studying for exams or debugging live networks, the simulator meets you where you are.

🎓

Telecom Students

Supplement lectures with visual, interactive simulations. See exactly how each 3GPP procedure works instead of just reading about it.

📶

Network Engineers

Quickly reference signalling flows for any procedure from 2G to 5G. Useful for troubleshooting, protocol analysis, and vendor interop work.

🔒

Security Researchers

Understand authentication, encryption, and integrity procedures across all generations. Study AKA flows, NAS security, and RRC protection.

366 procedures. 4 generations. One simulator.

Join and get instant access to the most detailed interactive 3GPP signalling reference available. Free to use.

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