SMS Opt-in | Text to Join | SMS Marketing Software | CallHub

SMS Opt-in to grow your mobile list

Collect phone numbers, email and more details from people who attend your events to grow your mobile list.







Collect phone numbers and emails

Collect additional details like name, email, zipcode from subscribers using automated follow-up’s.




Personalize follow-up’s

Use the information collected to personalize follow-up messages.






Nudge people to complete the sign up

Encourage people who drop off to complete the sign up flow.





Add new subscribers to Blackbaud and NationBuilder

Create profiles back in Blackbaud, NationBuilder and Action Network for new subscribers. If you can’t find your database in our list of Integrations, use our Zapier integration to connect existing tools to CallHub.




Maintain a clean list

We keep your lists clean by automatically unsubscribing people who reply with STOP, END, CANCEL, UNSUBSCRIBE, and QUIT.


"I love this product. It’s easy to use with a very clean user interface. The price is the most economical I’ve seen in the industry and last but not least is the wonderful customer support. They answer all questions very quick."


How SMS Opt In (Text To Join) works

Set up a keyword

Choose a keyword of your choice after creating a free account.

When someone texts you the keyword, they’re opted in to your list and can be included in future group texts.

If you have a large texting program, you can place a request for a dedicated short code after signing up. A dedicated short code lets you create unlimited keywords at no additional cost.


Set up your auto-reply

Draft the confirmation message that’s sent to subscribers as soon as they join your list. If you’re only collecting mobile numbers, the opt-in process ends here.


Create follow-up prompts for data collection

If you want to collect additional details from subscribers like name, email, zipcode etc. create auto-reply messages that will prompt them to reply with the details you want to collect.


Publish the keyword

Publish your keyword at events, on social media, flyers and other areas with high visibility. Subscribers show up within CallHub as soon as they opt-in.

If you’ve connected NationBuilder, Blackbaud, Action Network or any other CRM to CallHub, subscribers are added there too.


Common questions about SMS Opt In

  • What is the difference between renting a keyword and renting a dedicated short code?

    When you rent a keyword, you’ll be using a short code (eg.33339) that is shared between organizations. Hence the affordable pricing.

    When you rent a dedicated short code, you will have sole access to the short code, allowing you to create unlimited keywords at no additional cost. The monthly rental for a dedicated short code can range between $500 - $1000.

    If you’re starting out with SMS marketing, renting specific keywords is more cost-efficient.

  • How do I get a dedicated short code?

    Create a free CallHub account and submit a request for a dedicated short code. The process usually takes 6-8 weeks.

  • Can I use my existing short code with CallHub?

    Yes, please create an account and submit a request. If you’re using the same carrier provider as CallHub you can get started immediately. If not, the shifting process can take 6-8 weeks.

Our customers

amnesty international logo
dogwood alliance
sierra club
Organizing for Action
Human rights campaign

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