Compliance Pitfalls & Case Studie

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* Preferred channels by age: Viber (70 % DAU) for 25–45, WhatsApp (34 % DAU) for 18–24, traditional SMS for 45 +.

### 6  |  Channel Costs & ROI Calculations (≈900 words)

* SMS domestic A2P price €0.028–0.034; direct vs hub routes.
* Viber Business Messages €0.016 per georgia phone number data delivered, RCS €0.03, WhatsApp €0.068 (business‑initiated conversation).
* Example campaign math: 200 k records → €25 k total cost; 6.5 % CTR; 12 % conversion; CPA €32 vs CLV €180.


* 2022: Retail chain fined €400 k for insufficient consent logs.
* 2024: Political party SMS scandal before EU elections; lessons on opt‑in scope.
* Best‑practice STOP/OPT‑OUT flow in Greek & English.

### 8  |  Emerging Tech: eSIM, 5G Slices, IoT MSISDNs (≈900 words)

* eSIM adoption 9  % (Q2‑2025); implications for device fingerprinting.
* 097‑range IoT numbers; do not include in consumer marketing lists.
* 5G network slicing pilot by Cosmote for banking OTP traffic—€0.005 surcharge for SLA latency.

### 9  |  Security & Fraud Mitigation (≈800 words)

* SIM‑swap fraud trends; need for rapid HLR‑roaming checks.
* Flash‑calling vs SMS OTP—cost/UX comparison, legality under Law 3471.
* Data‑breach notification obligations (72 h to HDPA, 24 h to EETT if telco).

### 10  |  Activation Checklist & Roadmap (≈700 words)

1. Define purpose & Article 6 basis.