Sending bulk SMS to Brazil is regulated and monitored by telecom authorities and mobile network operators. Businesses must follow these rules to ensure message delivery and avoid blocking or penalties.
Siratel’s Brazil SMS gateway is built to follow these regulations by default, helping businesses stay compliant while sending high-volume messages.
Telecom Authority Governing SMS in Brazil
Bulk SMS traffic in Brazil is regulated by ANATEL (Agência Nacional de Telecomunicações), the national telecom authority.
ANATEL works closely with mobile operators such as Vivo, Claro, TIM, and Oi to:
Prevent spam and fraud
Protect user privacy
Enforce consent-based messaging
Any business planning to send bulk SMS to Brazil must comply with these guidelines.
User Consent (Opt-In) Is Mandatory
All bulk SMS sent in Brazil must be opt-in based.
This means:
Users must give clear permission to receive messages
Purchased or scraped databases are not allowed
Consent must be recorded and verifiable
Non-consented messaging is one of the fastest ways to get sender IDs and routes blocked.
Siratel ensures opt-in compliance across its bulk SMS service Brazil to protect delivery and reputation.
Sender ID Registration Rules
To send bulk SMS in Brazil, sender IDs must be pre-registered and approved.
Key points:
Alphanumeric sender IDs require operator approval
Brand name must match business identity
Generic or misleading sender IDs are rejected
Approval timelines vary by operator
Siratel manages sender ID registration and approval as part of its Brazil SMS gateway onboarding process.
Content Regulations for Bulk SMS in Brazil
Brazilian operators actively filter SMS content.
Restricted Content Includes:
Spam-like promotional language
Misleading offers or fake urgency
Financial fraud or phishing terms
Unapproved URLs or shortened links
Recommended Practices:
Clear brand identification
Simple, honest messaging
Portuguese language preferred
Consistent message templates
Siratel performs content checks to reduce filtering risks and improve delivery success.
OTP and Transactional SMS Rules
OTP and transactional messages are allowed and prioritized in Brazil.
However:
Templates must be approved
Message purpose must be clearly defined
OTP content should not include promotions
Brand identity must be visible
Siratel’s Brazil SMS gateway uses priority routing for OTP traffic to ensure fast and reliable delivery.
Promotional SMS Timing Restrictions
Promotional SMS messages in Brazil follow timing controls.
Common restrictions:
Limited delivery hours
Operator-specific quiet periods
Strict filtering during peak hours
Sending promotional SMS outside allowed windows increases the chance of message blocking. Siratel automatically applies timing and routing logic to keep promotional campaigns compliant.
DND and Spam Filtering Policies
Brazil uses advanced network-level spam filtering, even without a centralized DND registry.
Operators analyze:
Complaint rates
Message patterns
Sender reputation
User engagement
Repeated violations can result in:
Route suspension
Sender ID blacklisting
Permanent delivery failure
Siratel’s compliance-first approach protects businesses from these risks.
Data Privacy and LGPD Compliance
Brazil follows LGPD (Lei Geral de Proteção de Dados), similar to GDPR.
Key LGPD requirements:
Lawful data collection
Secure storage of phone numbers
Clear purpose for messaging
Ability for users to opt out
Siratel follows strict data protection standards to ensure LGPD-compliant bulk SMS delivery.
Why Compliance Matters When Sending Bulk SMS to Brazil
Ignoring regulations can lead to:
OTP delivery failures
Blocked campaigns
Loss of sender reputation
Legal and financial risk
Using a trusted provider like Siratel ensures that every message sent through its Brazil SMS gateway follows regulatory and operator requirements.
How Siratel Helps You Stay Compliant in Brazil
Siratel simplifies compliance by offering:
Pre-approved routing
Sender ID registration support
Template approval assistance
Content filtering checks
Operator-aligned delivery logic
This allows businesses to focus on growth while Siratel manages the technical and regulatory complexity.
