Why Your Twilio Bill Is Skyrocketing (And How to Stop It)
SMS, voice, and video costs add up fast. Here's how to spot the leaks before they destroy your budget.
Twilio is incredibly powerful, but it's also incredibly easy to overspend. I talked to 50+ companies last month and almost all of them had at least one "why is that so expensive?" moment.
The 4 Most Common Money Leaks
1. Phantom SMS
You're probably sending more messages than you think. Failed delivery attempts, double-sends due to retry logic, and test messages to your own number all add up. One company found they were sending 40% more SMS than their users actually received.
2. Long Voice Calls
Voice is billed per minute, and "silent" calls still cost. IVR systems that loop, abandoned calls that stay connected, and conference calls that go over - they all add up. A 5-minute "hang up" that should have been 30 seconds cost one startup $2,000/month.
3. Wrong Number Format
Sending SMS to landlines? That's a failed delivery that's still billed. International numbers without proper prefixes? Double charges. One startup discovered they were paying $300/month to send SMS to fax machines.
4. Unused Phone Numbers
You rent phone numbers monthly ($1-50/month each). If you've created numbers for testing and never deleted them, they're still charging you. A company with 500 "test" numbers was paying $1,500/month for numbers nobody used.
Red Flag: Is This You?
- No visibility into per-number costs
- Don't track delivery success rates
- Never review your phone number inventory
- Don't have alerts for unusual usage
If you said yes to 2+, you're likely overspending.
How to Fix It
Week 1: Audit Your Numbers
List all your Twilio phone numbers. Mark which are active, which are tests, and which haven't received a call/SMS in 30 days. Delete the dead ones.
Week 2: Implement Validation
Before sending SMS, validate the number format. Use lookup APIs to check if it's a valid mobile number (not a landline or VoIP).
Week 3: Set Up Alerts
Configure alerts for: daily spend exceeding 150% of average, any call lasting over 10 minutes, more than 10% failed deliveries.
The Bottom Line
Most companies can reduce their Twilio bill by 30-50% with basic auditing and monitoring. The problem isn't that Twilio is expensive - it's that you're blind to what's actually happening.