Hash phone number with SHA‑256

[Rajulk985]

Regex Normalization** – Convert 0xx xxxxxxx or +2330xx to uniform **+233 xx xxxxxxx**; remove dashes/spaces. Reject strings whose NSN length ≠ 9.

**Prefix & Line‑Type Detection** – Tag by first three digits. Landlines can’t receive SMS; separate them for voice campaigns.

**HLR & MNP Lookup** – Services like Infobip and iVeri offer Ghana connectivity at **US \$0.001–0.002 per query**. Output fields: status (active/invalid), roaming, current MNO.

**Mobile‑Money Flag** – MTN MoMo API’s `checkStatus` returns if MSISDN is MoMo‑ready; essential for fintech upsell.

**Consent Mapping** – flag missing or expired georgia phone number data consent (> 24 months inactivity) for deletion.

**Suppression & Dedupe** – Maintain internal “Robinson list” for opt‑outs; deduplicate across multiple sources via hashed MSISDN.

After this pipeline, smart marketers achieve **≤ 1.5 percent undelivered SMS** and spam‑complaint ratios under 0.05 percent—thresholds that preserve MTN white‑route privileges.

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### 7. Channel Mix: SMS, USSD, WhatsApp, RCS, Voice

* **SMS** – 100 percent device reach; domestic A2P rate **US \$0.017–0.029** via direct connections; gray routes cheaper but risk 30 percent loss.
* **WhatsApp Business** – 82 percent monthly reach; template pricing **US \$0.025 per business‑initiated conversation**; opt‑in mandatory.
* **USSD** – Session fees GHS 0.01–0.04; ideal for low‑end feature phones.
* **RCS Business Messaging** – MTN pilot (2024) covers \~4 million Android devices; cost **US \$0.035 per delivered**; converts 25 percent higher than SMS flash sales.