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Originally from the French Groupe Spécial Mobile , it’s a developed in 1984 to replace incompatible analog systems across Europe—but it quickly became the global gold standard. 📅 First commercial call: 1991 (Finland) 🔹 Why was GSM revolutionary? Before GSM: ❌ No international roaming ❌ Analog signals (poor voice quality) ❌ No SMS or data services gsm full info

📡 GSM Explained: The Technology That Changed Mobile Communication Forever gsm full info