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Optional capability

SMS Notifications

Text message notifications for OTP verification, alerts, and time-sensitive communications.

1-3 daysTypical timeline
$500 - $1,500Typical range
4Approaches compared

SCOPE DECISION

Does this belong
in the first release?

A capability is only essential when the product promise depends on it. Use these signals to keep the decision tied to user value.

INCLUDE WHEN

The product needs it now

  • 01
    Phone verification required
  • 02
    Time-critical notifications
  • 03
    Users may not check email quickly
  • 04
    Two-factor authentication
LEAVE OUT WHEN

The release works without it

  • 01
    Email is sufficient for communications
  • 02
    International users (SMS costs vary)
  • 03
    Non-time-sensitive notifications

IMPLEMENTATION OPTIONS

Choose the approach
that fits the product.

The right technology depends on ownership, scale, integration depth, and how much operational responsibility the team wants to carry.

TwilioIndustry-leading communications platform

Strengths
  • Reliable
  • Global reach
  • Great API
  • Many features
Tradeoffs
  • Complex pricing
  • Costs add up
  • Requires verification

MessageBirdEuropean communications platform

Strengths
  • Good EU coverage
  • Multiple channels
  • Competitive pricing
Tradeoffs
  • Smaller than Twilio
  • Less documentation

AWS SNSAmazon Simple Notification Service

Strengths
  • AWS integration
  • Low cost
  • Scalable
Tradeoffs
  • Basic features
  • Regional setup
  • Less control

VonageCommunications API platform

Strengths
  • Good documentation
  • Multiple channels
  • WhatsApp support
Tradeoffs
  • Pricing complexity
  • Less known

DELIVERY SEQUENCE

A practical path
through the work.

  • 01Register with SMS provider
  • 02Obtain phone number(s)
  • 03Implement phone verification flow
  • 04Build SMS sending logic
  • 05Handle delivery status callbacks
  • 06Implement opt-out/unsubscribe
  • 07Add rate limiting
  • 08Monitor costs and delivery rates

WATCH FOR

Common implementation mistakes.

  • 01
    Not handling delivery failures
  • 02
    Missing opt-out functionality (legal requirement)
  • 03
    Over-messaging users
  • 04
    Not verifying phone numbers
  • 05
    Ignoring international formatting
  • 06
    Not monitoring costs

QUESTIONS

Before you commit the scope.

SMS vs. push notifications?+

SMS reaches users without your app installed and feels more urgent. Push is free and good for in-app users. Use SMS for critical alerts and verification.

How much does SMS cost?+

Twilio: ~$0.0075/message US, varies internationally. Budget for verification codes (2-3 per user) plus any alerts. Costs can surprise at scale.

Do I need a short code or long code?+

Long codes (regular phone numbers) are fine for MVPs. Short codes for high-volume marketing. 10DLC for business messaging in US.

DISCUSS YOUR APP

Turn this decision
into working software.

Bring the product context and current scope. We will choose the approach after the release is clear.

Discuss your app