Hey everyone! I'm trying out a GSM modem here in the U.S. to programmatically send a lot of SMS messages, primarily for wholesale real estate purposes. However, I'm hitting a wall with carriers flagging and blocking my traffic. Just to clarify, I'm not spamming random people; I only reach out to those interested in selling their properties or who have distressed land.
I've tried a few techniques:
- Using my own script to connect directly with the modem's API.
- Adding random delays between messages.
- Making each message unique by including recipient-specific details to avoid duplicates.
Despite these efforts, I'm still facing blocks. I'd love to hear from anyone with experience in this area. Here are a few questions for you:
- What software tools do you recommend for efficiently managing SMS traffic through a GSM modem?
- Are there any message-queue or rate-limiting solutions that have worked well for you?
- Has anyone successfully integrated open source SMS gateway software (like Kannel or Jasmin) to help avoid carrier throttling?
- What are some best practices for handling retries and delivery reports, or for managing long messages so that carriers don't flag them?
1 Answer
You might want to check out 10DLC. It’s designed for higher volumes and can help reduce the chances of your messages being flagged. Just ensure you’re not using it for spam, which can be tricky. Most carriers are super sensitive right now, particularly with bulk messaging, so look into compliance and best practices before diving deeper.

I get it; you're focused on genuine outreach in real estate, but even targeting specific individuals with SMS can be seen as spam. Just be cautious and consider using compliant channels like 10DLC for higher volumes from the start. It might be a better long-term solution!