True Per-Second Voice Billing

Voice SMS & Automated Robocalls

Broadcast recorded voice notes and phone calls to thousands across Nigeria in seconds. Only pay for answered seconds — unanswered, busy, or failed calls are refunded 100% instantly.

Bulk SMS Pricing Voice SMS (Robocall)
₦
₦0.50 / sec
Per-Second Billing Rate
₦30.00 / min
Effective Minute Rate
₦0.00
Unanswered Call Cost (100% Free)

Interactive Voice Broadcast Calculator

Estimate your campaign budget and instant escrow refund

Live Estimator
contacts
10 1,000 5,000 10,000 20,000+
seconds
5s (Quick Alert) 30s (Promo Note) 60s (1 Minute) 120s (2 Minutes)
Cost per Connected Call:
Maximum Initial Escrow Hold:
Estimated Actual Spend (85% Answer Rate):
Estimated Escrow Refund (Unanswered Calls):
Sign Up & Start Broadcasting

Standard Duration Tier Rates

Sample per-call charges across typical broadcast lengths

Duration Cost / Call
10 seconds (OTP / Quick Code) ₦5.00
20 seconds (Short Reminder) ₦10.00
30 seconds (Standard Promo) ₦15.00
45 seconds (Detailed Invite) ₦22.50
60 seconds (Full 1 Minute) ₦30.00
Unanswered / Busy Call ₦0.00 (Free)

100% Fair Billing Guarantee

When launching a broadcast, TextFlow holds an estimated escrow in your wallet. As calls complete, we calculate the exact per-second duration listened. All unused escrow is automatically credited back to your balance in real-time.

Why Businesses Choose TextFlow Voice

Built for enterprise-grade throughput and crystal-clear voice fidelity

High-Speed Simultaneous Dispatch

Dial thousands of Nigerian mobile numbers simultaneously across MTN, Airtel, Glo, and 9mobile networks with ultra-low latency.

MP3 & WAV Audio Support

Upload pre-recorded voice files or audio adverts. Our audio inspector validates your file format, channel, and exact duration before launch.

Detailed Real-Time Call Auditing

Track live call status, answered durations, carrier names, and individual customer charges with transparent delivery logs.

How to Launch a Voice Campaign

Get your voice broadcast running in 4 easy steps

1

Upload Audio

Upload your recorded MP3 or WAV audio note.

2

Add Phone Numbers

Paste numbers or import from your Contact Book / CSV.

3

Instant Automated Dialing

TextFlow dials the recipients and plays your audio note.

4

Audit & Refund

See answered durations and receive instant refunds for missed calls.

Frequently Asked Questions

Everything you need to know about Voice SMS pricing and delivery

Voice SMS is billed strictly per second of answered call time at ₦0.50 per second. There is no minute rounding. If a user listens for 14 seconds, you are only billed for 14 seconds.
You are charged ₦0.00 for unanswered, busy, or failed calls. Any escrow funds reserved for those calls are automatically and instantly refunded to your wallet when the campaign completes.
We support both standard MP3 and WAV audio formats up to 10 MB in file size. Audio files between 5 seconds and 120 seconds are recommended for maximum engagement.
Yes! Developers can initiate automated voice calls, OTP verifications, and IVR broadcasts programmatically using our RESTful API. Check our Developer API Documentation.

Ready to Broadcast Your Voice?

Sign up today to start sending automated voice broadcasts across Nigeria with true per-second billing.

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