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Developer Guides

Developer Guides
OTP API provider comparison showing six providers rated for Africa delivery with direct MNO routing and signal strength indicators

Best OTP API Provider 2026: Twilio vs Vonage vs Arkesel Compared

You need an OTP API provider that delivers codes reliably to African phone numbers. Most comparison guides rank providers on global features and US-centric criteria. None evaluate what matters for your deployment: direct network connections to African MNOs, delivery speed to local carrier networks, USSD fallback when data coverage drops, and billing that does not

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Developer Guides
SMS character limit shown across three encodings: a full-length bar for the GSM-7 default alphabet at 160 characters, a shorter bar for the GSM-7 extension table, and a bar under half the length for UCS-2 Unicode at 70 characters, with the cedi sign marked as sitting in neither GSM-7 table.

SMS Length & Unicode: Character Limits Explained (2026)

A single SMS holds 160 characters with standard GSM-7 encoding, or 70 characters when it contains Unicode (UCS-2). Anything longer splits into concatenated segments of 153 or 67 characters each, and each segment bills separately. That one rule explains most surprises in SMS sending: why your SMS character limit suddenly drops to 70, why one

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